GFI issue in bathroom -trips 3 recptaces - will not reset

X2 on checking and/or resetting the L1 or L2 reset buttons on your inverter. I had a similar problem about 2 years back. Was almost ready to start replacing outlets. Based on recommendation of a fellow camper, checked the side panel of my inverter and noticed that one of the two small reset buttons had popped out. Pushed it back in to reset and all was good.