"I don't work on bikes" - why not? Most of the regulars on this thread service their own bike. For more major work, many have developed a network of friends who have specialized tools and/or skills. I recommend learning how to do basic maintenance. It ain't rocket science.

Here in Portland, Oregon we have lots of bike shops that could work on your bike. Note, however that a "standard tune-up" is over $100 + parts. You can get a basic tool kit for $40 on Amazon that is enough to nearly strip the bike down to individual components and reassemble it. Cable kits can be had for cheap. You can find all sorts of videos on working on older bikes - which are much simpler than new ones! I was 15 when I bought Super Course and did all the work myself, even then. Back then we had these things called "books" which you could find in the local library.

If that's more than you want to take on, and just want to ride the bike, a quick check shows you have over a dozen bike shops in Palm Springs. I'm sure most of them would be happy to service your bike, just call around.

Bicycle co-ops often have repair classes, and will provide all the tools and hints you'd need, as well as having the spare parts you might need. I didn't see any bicycle co-ops in Palm Springs, but you could extend your search in the Inland Empire. Since you posted here, I'm sure someone not too far from you can help out with other suggestions.