It is normal for the air pressure to drop slowly when parked with the engine off. You said it bleeds off after 24 - 30 hours but didn't say whether it drops all pressure over that time or just drops some noticeable amount. If it drops all pressure you have a leak that should be fairly easy to find.
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2005 Newell 45 Ft.
Detroit 60 Series 515 HP Engine
Some people call me the Space Cowboy
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