When I bought my scamp
it had standing water in the floor of the closet, and under the sink. The water had been there for as long as a year, not really certain. Lots of moldy books, maps, pillows etc. Yuk.
After cleaning all that stuff out the mold smell is mostly gone.
Today I found the source.
The fresh water tank is under the left hand seat cabinet, and the plastic screen holder between the tank and the pump was shattered. More moldy stuff around the tank, now pitched. Tomorrow i will start calling to find the part, local if possible. I found it on the internet. Then I can test the water system. I have been doing without the water system because I knew I had a problem.
At least the part was 'get at able'! A hose clamp and a threaded neck on the pump and it was out. Once I replace it i need to spray everything down with apple cider vinegar, including the carpets.
One small step for man...