Up on roof....remove outer cover (shroud) then remove metal cover over evap cooler. Drip pan is under evap cooler. You may need to slightly shift evap cooler to get to drip pan drain holes.
When holes get plugged the drip pan will fill up and then overflow....the water gets pulled by fan blower into discharge plenum and will leak out of ceiling grill into inside of RV.
Clean evap cooler while up there.
The 4 hold down bolts can be accessed by removing ceiling grill assembly and then tighten them just snug...don't overtighten or you will crush roof gasket which can cause A/C unit to sit to close to roof and that can block the drip pan drain holes also.
