I have a couple of their older scopes, a 3.2-17x SN3 and a fixed 10x ST10. I also have a few of the newer FDN scopes, a fixed 10x, a 3.2-17x, and a 5-25x. I've seen a few comments where people claim the newer scopes aren't nearly as good as the old models, but very few can ever really support...
Nikon stopped selling scopes back in 2021, so I would be very surprised if they still have parts for an older Monarch UCC...that scope has to be at least 10-15 yrs old. That being said, maybe you can get someone on the tech side who can actually cross reference it against other Nikon scopes...
You'll almost certainly have to ship it out, I'm not aware of anyone in Georgia doing repairs. These guys below used to be the go-to for older Redfield repairs..
https://ironsightinc.com/redfield/