If you don’t get enough attention on this post, this linked sub forum would also be an appropriate place as well
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https://omegaforums.net/forums/zenith-watches.33/
Given the age of the watch and the fact it isn’t running properly, I wouldn’t wear it until it’s serviced, regardless of if it keeps great time. Continued wear can cause further damage that will inevitably run up the repair bill.
One that is knowledgeable with the El Primero movement and one that has a supply of, or ability to source, Rolex parts.
I had the Sub Sea HS360 and it needed a service. The chrono wouldn’t reset and the auto rotor weight could be felt spinning under its own power.
I asked my regular go to watch maker if he could service this movement. He explained that he loved working on the El Primero movement and would service them somewhat frequently; however, he had to turn me away as his Rolex parts supply was dwindling and he was reserving those parts for other jobs (he regularly services vintage Rolex). I had a hard time finding someone to service mine. With the help of a few members, I reached out to other independent watch makers but was turned away for similar reasons that my watchmaker gave me. That, or they weren’t taking new clients.
I’m in the states and ultimately reached out to LAWW, who accepted the job. This was just about maybe two years ago now- the estimate they gave me was a base price of ~$1,600 to service the movement, which they stated did not include cost for parts.