Britony Combi 80 SE leaking

[Jezzy]

Has anyone changed an air vent on one of these before?
I have just been to one that is leaking from the top of the air vent, it is only dripping minimally, but as it's behind the pump and hard to get at, and the pdf manuals i have don't mention anything about changing this part, how do i do it? Do i have to take the pump out to get at it, or should i just change the top part of the air bottle?

 

[Beerlover]

You can just change the top of the AAV, if it is hard to get at remove the pump head - four allen bolts. Remember to isolate and drain the boiler first And make sure everything is clean before reasembling.