Beer from my keg is flat

[Christoff]

Suggestion: take some of the now clearly overcarbed beer and capture some, stir it really well at room temp to get as much CO2 out of solution and take a gravity (SG) reading. If infected, it will have dropped much lower than the FG you measured at bottling time.

Interesting. I don't think there is anymore in existence. But this gives me a good reason to a final sweep of the beer room to make sure.