problem with wilkos pressure barrel

[Manngold]

Hi all.

I purchased a wilko's pressure barrel two weeks ago and all was fine until this evening. I wanted to move it to the shed so picked it up and must have squeezed it too hard as the white plastic valve started to foam. I tried to draw some beer off, but none came out.

Should I

A) Open the lid and 're prime?

B) leave until when I want to drink it.

My head is saying leave it, but I am worried as have brewed it especially for my birthday party.

Please help JBK!