Check the rubber boot that is on the coax cable at the roof antenna this has been a common spot for leaks. When I had a leak someone suggested putting some silicone sealant around the boot which I did and had no more problems.
Dean & Cindy (Go DAWGS)
2013 Ram 3500 CC DRW 4.10 "Plain Jane"
(RIP "Struck by Lightning")
B&W 3600 Hitch 25K/6.25k
2012 36RL, Disc Brakes, G614's, 7K axles, Combo WD, Awning Toppers
Full Time Since April 1 2015:)!