+1 on the keg lube 3 bucks for a little container that will last you a while. Helps seal all gaskets.
I learned recently that Home Depot and Lowes sells a similar product in the plumbing aisle. It was posted here a few weeks ago.
Another thing to check is that it's actually leaking around the edges of the lid and not your PRV that's leaking. You might try snugging up your PRV to make sure it's not that.
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