I posted a query about this earlier (could not find old post so adding a new one).
The toilet bowl does not hold water it slowly leaks
out. I did check the seal and no debris or obstructions found. The troubleshooting part of the user manual also indicated check the clamp that may need to be tightening. I disassembled the base cover and handle this AM. The big clamp is tight and the handle seems not to have any adjustments.
So I re-assembled the few bits and went back to inspecting the ball valve. I discovered that the ball valve is not closing completely to seal the bowl. If I manually push it back a bit, gently as no forcing is needed it does seal fine.
I have not found any info about the return spring or adjustments on the unit.
I assume it is still under warranty (new Oct. 3, 2015 from Scamp).
I sent an email to Dometic/SeaLand to see what they suggest.
Any ideas from you experienced FGT folks in the meantime?
It was working fine for our 3 month trip to California Mid Jan-April so it clearly was not a wintering issue.