Could be your front tank feeds the air suspension, mine does , 65 psi is the shut off for the brake saver; keeps enough air in the tanks to operate the air brakes if an air bag( spring ) ruptures.
My XC, the front air suspension will vent to re-level every time I step off the steps , so if your in & out of the coach often , the front suspension will bleed the air down, and that's normal. If the air goes down and you've only been out & in once you have a leak.
I'd put in a call to Freightliner Help line and ask for an air system diagram.
I'd forward you mine but there could be changes in the 6 years between them.
1-800-385-4357, have your serial number handy.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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