Ideal Isar H24 dripping

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Dear All,
we have an Ideal Isar HE24 boiler, which usually still works perfectly well, so that we don't see a reason to replace it now.

Recently, it started dripping. It's hard to see where it exactly comes from, but (after some moderate disassembly) it looks like a pipe connection. I'll try my best to describe it:

It is below the plate heat exchanger, on the right side. The pump is silver in the front and has black plastic parts in the back. These black plastic parts go below and connect with the plate heat exchanger. From the back, there are two pipes going into this black part attached to the pump and plate heat exchanger. I think it is the left pipe, where it connects with the black part. The water goes onto the metal plate which is directly below the plate heat exchanger and drips down from there.

From the manual, I would guess it is the "DHW cold in".

In the boiler manual I have, in the exploded view, it is probably item 60, labelled as "DHW inlet pipe"

I have already replaced the plate heat exchanger before, so I guess I'll get to it.

My questions:
What parts would I ideally get before disassembling it? I'd prefer to spend a bit more money to be on the safe side I have everything at hand, instead of assembling/disassembling a couple of times until I have the right bit.
- Just a new rubber seal?
- A new inlet pipe? (to replace the bit between the main pipe with shut off and going into the pump, just a short knee shaped bit)
- A new 'back' part of the pump (the black plastic part), in the exploded view probably no 70, "Pump manifold"

What else might I need? I think back then I also had silicone grease or something like this?

As you probably have guessed, I'm not a plumber or alike, but I do stuff around my own home.

Best wishes,
Andre
 
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Could just be a fibre washer is all that’s needed, but as per @ianmcd a picture tells a 1000 words
 

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Thanks for the reply. Sorry, this is a really bad picture. I thought I took a movie, but for some reason it didn't save it. It was very hard to get into that corner and have the camera focus right.

In the background, you can see how the right pipe comes up and bends (should be the right no 60 in the exploded view above), and then there's this black crusty bit. That's were the pipe goes into the black plastic (I presume no 70 on the pic). I guess the crust comes from a longer leak...

It's put together now again (family home with kids and we need the heating), but I can try better pictures next time...
 

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How do I know the size of the washer? Do I have to take it apart first?
 
Hi All,
I finally found the time to take it apart (doing it right now), but I'm not sure whether I'll manage. I removed the pump cover (I hope it stays sealed later on, the rubber seal seems dirty and brittle), but I'm not sure I'll manage.

Red arrow shows where it is dripping, it's where the pipe goes into the black plastic. Can't get any better view because it's all so cluttered, I don't get there with the camera/phone.

I may not be able to remove the plate heat exchanger, because one of the screws (green arrow) is damaged and the allen key just moves without turning the screw. (I may be able to unscrew it on the other side and just keep it attached to the black plastic bit, though.

I'm not sure I'll reach all the clips etc to remove the black plastic. Does anyone know whether it can be removed with the boiler installed?

Any other tips are highly appreciated, I feel a bit lost right now :)

Best wishes,
Andre
 

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Right now my main problem is that I can't loosen the hard-to-reach pump clips holding the pipes etc in place with the black plastic bit.
 
Apologies for talking to myself, but maybe it's useful for someone else at some point (and input would still be helpful!)

I have now removed the pipe bit which is leaking. The O-ring looks fine, but for some reason they used silicone or something as well??? See picture
 

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