Can anyone help. My son has a water leak on his boiler which is an Ideal Icos HE15. I have talen the front cover off and established that the leak is coming from the bottom of the heat exchanger unit on the left hand side. The side/casement of the boiler unit does not come off so i cannot get a screwdriver in to tighten the screws to hopefully secure the seal if this could be done at all. Is this something that can be fixed or is the problem terminal!!