Help. I have a saunier duval combi boiler and it seems to have sprung a bit of a leak. There was no water pressure at all so i thought I would put the pressure up a tad. Unbeknown to me there was a burst water pipe down the road that the engineers were working on. Now, the water pressure in my boiler is up to number 5 which is on the red. How do I get this down? Ive turned the boiler off and isolated it, but now Im stuck with this leak! Any help would be appreciated