We too had the front rams leak on suction side (retract) allowing them to seem down. No external leaks. With an external leak, it is possible for air in system to cause things to move, but most likely is the rams inner seals bypassing. As Chris said.
Ours was an early 05 model with the smaller rams, they replaced them with the newer larger ones, no problems since. Lippert should cover the repairs for you. Call them.
Cheers,
Bill
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