Welcome to iRV2 .
First post I see.
Sorry you're here with problems .
Is your fridge on the GFIC protected circuit?
Some years of Norcold fridges would trip GFICs when the ice maker needed defrosting.
Or in your case the problem started with a rain storm , maybe enough water got through the lower fridge vent to start the issue.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.