Found that the granular carbon filter in the water supply had leaked carbon bits into the system and blocked the check/pressure valve, stripped and cleaned it but needs replacing really as screw holes are cracking, also system needs cleaning now, the auto vent on the Thetford cassette is missing so when you pick it up it leaks if near full, got some broke window stays, and some door catches do not hold the doors closed when traveling, got a couple of loose body to chassis mounting bolts loose at the front, will need to cut them off and replace, that is about it really, Rick