Jayco 165 Feather soft floor
New owner of a 2005 Jayco 165 Feather. While poking around under the master bed I found a good sized portion of the floor that is very soft. No roof leaks are evident. The water heater is located in that area. The previous owner swears they had no water heater leaks, but it is suspicious.
What do I need to do to replace the flooring in that area? Any tips would be helpful.