Hi guys i've a leak in my ferroli f30 domi combi had a look inside and i can see the drips coming from the pipes that go into the heat exchanger its a small leak with wee drops it looks like its from the joint. whats my best course of action? my pals a plumber he says i could try some sort of leak sealer in the system otherwise i could be looking at getting ferroli out. im afraid of them coming out as they're £70 plus parts and id assume that they'd change the heat exchanger. thanks in advance any advice is appreciated