Hereís an update on my post from 9-2-2010ÖÖ
I may be the only owner having this issue, but I suggest checking your ceiling headliners to make sure they are firmly adhered to the ceiling.
All of the panels in my 2010 GT 378TS are sagging. The panels that have light fixtures, smoke detectors, speakers, etc. screwed to the ceiling appeared OK, but sagged when these items were removed. When I first noticed the problem, I thought it was a shadow that was being cast by the way it looked. When I pushed the panel back up on the ceiling, it was ďtackyĒ sounding but would drop back down in a very short time.
Fortunately Iím still in warranty, I purchased my unit in January, 2010.
My dealer got with FR and FR gave the OK to replace/repair and re-glue ALL the ceiling panels. FR stated that it must have been bad adhesive used in my unit. Donít know if the adhesive used is in bulk or if it is one-on-one batch adhesive per unit manufactured. Dealer said the process will take 5-7 days.
I hope Iím the only one having this problem. My GT 378TS is a great MH, but these things do happen. Happy Camping!