Randy it's probabaly one of two things: The seals or the adjustment of the compression slide (lifting arms). Now I may be using the wrong term (compression slide) but that is the final stage of the "flip open" option of the sunroof. This compresses the roof against the seal when closing. Sometimes I will have to flip the roof down, slide it back (open) and then forward to get it to seal good. I have not seen any drains up there.

Look at this file in the FSM program\Chassis\77-170.pdf

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