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I had Prevost replace my engine air compressor despite one shop saying it was critical and one asking why I wanted to do that. After the replacement there was a serious air leak at the new compressor and I had to take it to another Prevost shop to have that corrected. Just suggesting that the new air compressor might be the source of the problem.
Good luck! Mine is a 40′ 98 CC as well. Not the original owner! I’m impressed that you are.