Condensation leaking from boiler

Joined
10 Dec 2011
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Location
London
Country
United Kingdom
I have a Potterton Promax HE boiler which has recently started to leak with water dropping from the yellow plastic nut/cap at the bottom (appears to me to be an overflow for condensation). Any suggestions on what I could do? One thing I did find when I undid the nut is that there was a lot of grainy grey matter around the nut on inside of the plate.
Many thanks in advance.
 
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