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I was able to replace the o-ring and add an extra gasket with the information from the old double gasket thread all without removing the rear head. I also put RTV on it and it never leaked in the 10+ years I owned the car after the repair. 

UPDATE - I believe I may have found a shop with a mechanic having the experience to have worked on these motors that will do the job. My first hunch was to go to a Chevy dealership as the Lumina had these motors as well, those Z-34's you almost never see (?). As soon as they found out I was in no rush to get the car back, they were more open to the idea of working on it. I guess they thought I wanted it done yesterday. Not the case, anytime between now and July 22 will do........ Stay tuned

One should have the service manual within reach for electrical diagnosis.

Still having trouble with the wiring on the new relay box. It came with 4 wires to control a switch. My original switch has three. I did power it up but it still will only tilt and close. Was going to try a new switch with a vent/close/slide button. I just don’t understand why my sunroof will not slide open. 

You are correct on that point, I will be checking my local independent shops to see if they want the job. Not everyone wants to work on these. The first thing I will hear is the job would cost more than the car is worth. I bought this car new in 1994. I gave it to my dad in 2012 who in turn sold it to my brother in 2018. My brother did a swell job of running it into the ground, but when my dad passed away 1/2020 my brother didn't want the car anymore and  showed up at my house a month or so later and handed me the keys. That makes me the 1st and 4th owner. There is no mechanic on this earth that's going to be successful in convincing me that any job needed to be done on this car will exceed its value. I watched a 24 minute video earlier today on how to do this job. II won't be doing it as a result of watching it. These videos are valuable in that respect as well.