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Well the job is complete, almost. I have a piece of trim to fix. The yellow lever in the last two pictures is fine, no need to alter it. The problem was two fold. The lock mechanism was gummed up. Cleaned it by spraying Kroil or something lime it, into the mechanism and kept activating it until it operated easily and fully. Then did a search on the web for the actuator. The Buick part number is 22020256 (Actuator). Found them from $16.00 up to $80.00. Auto Zone had two of them so I bought both of them this morning. Put one in the left door and everything works as it should. If you reference the second picture the grommet has a slot in it. The new one is a circular hole.

Sorry I am late to the game. In picture 2 if you put a real small diameter piece of hose on the the metal part that goes into that rubber boot you will have no more problems. The actuator never goes bad, that slit in the grommet just gets too big.

Ronnie, thanks for your reply, I am the same way, I hesitate to answer a question when it is for a model I do not own or have personal experience with. But I do have a magic Reatta tool, it is called a "Buick 1986-93 E Parts and Illustration Catalog" It is about five inches thick, But it covers all the Reattas, and Rivieras of these years. According to the catalog, part number 22020256Actuator is used on all 88-91 Reattas and Rivieras. If you want me to look up a part number, let me know. Jim

Im in the Dartmouth Area myself

I have the same catalog, too. I ditto Jim's offer if anyone needs a part number from the catalog.

Sorry that you go no replies to your questions. I wasn't able to give you a good answer. I always hesitate to answer questions about '91 models since there are a lot of differences between them and earlier models. Thanks for letting us know what you did to fix the problem.

Sorry, I did change those as well, just totally forgot to put it in there, my bad

I know this is an old thread, but I have an answer for the thigh adjustment. The motor , drive cables, and worm gear are all in the part that moves out from the seat. The same process that I used for the recliner worked on the thigh adjustment. Clean the threads of the stationary bolt the worm gear rides on. I kept spraying it with KROIL penetrating lubricant. Then I kept working the motor back and forth to start getting movement, a little at a time and finally it started working. No disassembly, no parts removal, just a bit of time spraying the moving parts and time. Jim