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The most common leak on those is the rubber or plastic plugs on the top cover for the shift rails.
Rear seal I suppose would be next.
You should have a removable floor panel. You can inspect the top of the trans, replace the plugs up there, take the top off the box and service the shifter and shift forks as well.
Link in post 4 tells the tale. I thought there was one with pictures but once you get that cover off, it will be very clear.