Let all pump pressure drop does it still leak? Do any pressure lines double back toward the tank. My bet fresh water drain line or feed to pump . The drain may be teed off the feed line. Both are easy to freeze if you don't keep drain line open, a shift of MH may push residual water in the line to freeze later.. They are low closer to outside cold than most other lines. The feed line may leak in air in as pump is running and make it difficult to pump up pressure. Test that theory with low amount of water in the tank ,so there's less inlet fill pressure..
Not sure of your rig I have doors that do open but have to be unbolted from under side. Some coaches have basement pods that can be removed and may have stuff to access behind them.
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95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
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