[Wanderman]

I just went to do some basic check and maintenance and found the Passenger side engine access door compartment ceiling had fallen down at the rearmost section. Looks like the wood is all rotted there. Will be removing tomorrow, but what would cause that? Some water ingress from the outside? We've had a ton of rain lately. Or something above? Any idea what's up there. It is near the rear bath, could be the rear microphor or the shower? Neither of which is being used.