Manufacturer poor quality control caused a flood

I'm not sure what the issue is exactly. IF we're talking about a seal / cover that's on the exterior, just take it to the darn dealer. A "return to factory" is for a major repair that the dealer can't or shouldn't do (like a delaminated wall).

The only thing that would change my mind is if you have additional damage from the water.

I would not indicate that you let this happen 3 times.

Thor is not well know for quality or particularly good post-sale service.