Glenn,
If it's not a sound generated by an electrical device and you have a couple of air valves that are warm, the first check I would make is for air leaks. You can start with a squirt bottle filled with soapy water and check for bubbles. If that doesn't find the problem, you might want to pick up a ultrasonic leak detector.
jon
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Jon & Chris Everton
1986 40' Dog House #86
0 hp 8V92 Allison HT740
Soon to be 500hp ISM with ZF 6 Speed
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