Had the same problem with this type of boiler the pressure kept dropping but there was no leak but mine sounded like the local RAF station were trying to land in the house. Keston played dumb about it at first but after a few irate phone calls from my plumber they did turn round and say there...
Our m/c is about 5 years old and has started to leave brown gunge on some of the washing. It can be rubbed off as soon as it is removed from the m/c but if left to dry only washing will get rid of it. All the waste pipe seem clear but there is a brown sludge inside the door seal not a great...