Amos, if you have a humidity meter, use it to test for moisture in the wall board in a inconspicuous area. If there is moisture after a rain, then you have a leak.
Do you have the manual on your steps? If so you have every thing you need to work on it on a bench. You will need to simulate the various power circuits and switches for testing. Good luck and keep us posted.
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Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7
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