I tried to follow the FAQ to remove the sunroof panel and replace the seal. However, I found that accessing the rear screws with the sunroof in vent position was far easier inside the cabin. The FAQ suggested getting these two screws from the roof.

Also, I bought a sticky-back seal from IPD after calling their sales support and asking which seal was the right seal. Turns out, their seal is too short, and very hard to make work when stretched out.

I abandoned the IPD seal and re-attached the factory seal. The problem was not that the seal was bad or leaking but part of it fell down, which allowed rivers of water into the sunroof mechanism and onto the seat below. To reattach the original seal, I used JB Weld's marine epoxy. So far so good.
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94 940 n/a 320k+ and rolling, owned 18 yrs; 05 XC90 2.5t for the wife; sold 92 745T; sold 88 764T