Wakefield signs is who we use at work for our neon signs. I don't believe they actually repair neon tube itself but can sent it off for repair. I do not know of a local company that does neon repair in house.
I have a buddy who MIGHT be able to do it (if he wants to). He has repaired dozens of those. Anyhow, I will let him know about this, I'm jut sure if he wants to do this on the side or not...about how much are you willing to pay?
(FWIW, I have no idea anything about how much repairs for these things can normally run)
I saw your post on the classified thread. How much do you want for it and do you have any photos? I'm in BCS. Text me at 3 six 1. 8 one 5. 9 zero 4 two