Very soft floor in my 2006Endura right over the holdingtanks

[amman1725]

Hey all! Hope everyone had a great thanksgiving; we just got back from the WA coast where we actually had sun on Friday! First test run for the new roadmaster brakemaster system I installed for a towed jeep; It worked great! But now for the question that has been bugging me for quite some time:

The floor just outside the shower is very soft and spongy; it continues into the bathroom; I took some measurements and the soft area is right above where the holding tanks are below; Just forward and aft of the soft area the floor is firm and fine; you can feel what appear to be floor joists that run from one side of the coach to the other; they are about 18" or so apart (I haven't measured that part yet); and its spongy right between these joists; there are no roof leaks that I know of or can see any signs of; the rv stays in a covered garage when not in use; there is no evidence of a water leak from below although the holding tanks and fuel tank block most of the view; the water pump does not cycle so there is not a water line leak; the shower drains fine; the only thing that is wierd is that when we use the shower the pump pressure is not what is used to be and pulsates a little; all the other faucets work fine with great pressure; This feels like a water rotting subfloor issue but where is the water coming from? plus there are no drips or stains; has anyone else ran into this problem? I realy don't want to cut up the floor and look but I don't want my wife or I to fall through the floor either! Our dealership went bankrupt and disappeared (no big loss they were incompetent); Poulsbo RV is the new "Gulfstream service center" but we've had some problems with their mechanics not knowing crud about Gulfstream specific issues such as slide out valve assemblies etc... Thanks in advance for any info or advice you might have; this forum has been very helpful to me in the past and is the first place I come searching for answers; Thanks again, Jeff.