That is when your air compressor governor is kicking in. The leak can be anything.
What is your rear air pressure doing?
EDIT #2: Also, on a possibly related note, my step cover slides shut on it's own after about 24 hours. The airlines to it must be pressurized some because even though I can push the cover shut...
TV antennae up.
Is there a way to properly disconnect that switch/little white box completely so I can rule it out as something sending false positives?
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