Not sure where you live, but if you live close enough to Norwal try Jason Blackwell at Bobs Tackle on Firestone Blvd.
Jason is a great guy, bought the shop several years ago. He worked for Bobs ( Bob Prescott) for many years before buying the store. Also very knowledgable fisherman; both Freshwater Bass and Saltwater.
I'm also looking for a shop or someone that can help me out I got 1 Newell that needs drags and something wrong it doesn't want to go in and out of free spool I also got a few saltist in need of a service.
Skeet- I'm not the least bit mechanically inclined but used to work on all my Newells all the time when I fished a lot. Penn 500 drags for all of them, Smoooth brand or HT100. Bearings are the only thing likely to need maintenance other than grease on the gears. Oil the bearings or replace if they're bad. If you can't find parts closer Fisherman's Landing would likely have anything you need.
There's like 10-12 parts total in a Newell. If you're not completely drunk and can turn a screwdriver you can fix anything that might be wrong with them in just a few minutes. Really simple reels. Parts are still readily available too.