Forgot about Brad since he moved the shop from Williamson to Hampton.Brad at Full Blown firearms in Hampton could handle that for you. A can of Kroil oil and a few minutes would probably have it up and running just fine. I had one of those around 1980 and recall it a simple disassemble. pretty sure youtube will have a few videos. You could probably send it back to Charter arms.
Yes, I would recommend him as well.
Hampton is about an hour away, but would be worth the drive.
General cleaning is $75.00 & includes take down, clean, inspect, oil & reassemble.