If you have the Dometic Blizzard, two piece cover can leak. Some folks have taped. Could be drain holes are plugged up, take off cover to check. May be loose at roof, water getting in thru gasket, old style four bolts extending down thru inside vent. Pull the vent filter you can see. If new style, lugs directly into the roof. Take AC cover off you can see. As best as you can, check the gasket for crimping or other damage. Those would be my top suspect issues.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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