Hi - On our '21 View, the top cap was held on by six or eight screws under the sealant, driven vertically through the rear cap into the roof structure. In addition, it was also secured to the rear wall by three horizontal screws, protected by those little esthetic cap covers.
With the sealant removed, the vertical roof screws removed, and the back wall screws out, the cap lifted off easily. We have running lights in the rear cap, so I did not worry about removing the top cap completely - I secured the loose cap to the sky light and ladder with tape, and did my work with it hanging there.
If you wish, drop me a note and I'll pass you some notes and extra photos I have for the job.
Cheers!
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