In this case, it is obvious that the tail light seals are leaking. I've lifted the bottom of the window gasket with a small right angled probe and there is no indication of rust. It is usually possible to see a slight bubbling along the bottom of the window seal if there is rust there.

What else we got for the tail lights?

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.