customer left filling loop conected as the boiler was losing pressure,i was called in and when i got there the filling loop was connected and on, filling the boiler,but rather than go out prv it was going through the boiler and coming through the condensate trap,the only explanation for that was the heat ex was damaged,i took bottom cover off heat ex and i could see water, not a lot but defo water,has anyone ever come across this before.