Check the compression gauge first. It could have a piece of debris in the Schrader valve that's preventing it from holding its pressure reading. The KISS principle applies to test equipment before you start jumping to conclusions.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!