Leak at rear bumper storage rotted floor inside

[reeran]

My 2008 27 FB has leaked in the back since new. Airstream and Windish in Denver both washed their hands of the problem even though it was apparent during the warranty period as the vinyl flooring kept bulging. Their fix was to restretch it a few times until the warranty ran out. I ended up replacing all the flooring myself with HD Allure vinyl planks. I tried to fix the leak but it is back or maybe never left. I have now discovered the issue about the storage bumper lid design flaw. My plywood seems to be more rotten on the top than the bottom and it seems that a leak due to this problem would feed water to the underside of the plywood as the lid tucks under it. I could also have a window leak from the curved window seal as I see some water tracks inside on the skin but I am unable to replicate this leak happen with a garden hose. Any feedback would be appreciated as I let everything dry out prior to another repair attempt.