Automatic air vent leaking

Dear professionals, could someone kindly advise on per below issue, please let me know if more pictures or details needed. I think my Auto Air Vent is now leaking. A little background on the boiler – installed a year ago in Feb, Valiant Heat only boiler Eco Tec plus 424, plus new pump. The leak is only on the right hand side vent, some water descale is visible, but the left hand side one is completely clean. The leak itself is mostly everyday, sometimes quite a lot of water comes out, the water itself is very smelly, like drain smell. Could someone kindly let me know what the issue is, I’m worried to call someone in without knowing what the problem is as last year boiler installation was a nightmare, the gentleman didn’t know what to do with Fault 23 on the new boiler so I posted on here and only after reading the replies he managed to work it out.

Thank you in advance for your time!

Irina

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