Check the 14 x 14 - inch seal shown in this pictorial. It is sandwiched between the top unit and the roof and should be depressed about a 1/4-inch. There are four long bolts that youcan see from the bottom side that may have worked loose. check to see if the roof gasket is depressed all the way around.
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS