I would go up and pull the shrouds on the ac units. I feel quite sure your drain holes in the bottom pan are clogged and allowing the water to back up into the duct system or flow into the ceiling. Not much to it so do not be fearful. You may want to go ahead and clean your coils while you have the shrouds off. This will make your system more efficient. You will clearly see the drain holes when you remove the shrouds.
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:)!