I am going to assume that you have checked all of the breakers in your RV's electrical compartment. You should also check the cabinet under the sink to see if they have a circuit breaker or another GFCI outlet hidden under there.
If you have done all of the above it may be time to wave the white flag on repairing this yourself and take it in and have a Certified RV Technician diagnose and repair the problem.
Please let us know what the problem turned out to be.
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