Is the 505-T working and just tired? Or is it not working, and needs to be repaired?
Caps are cheap. Labor is the killer here. I just did a 250-TX,450-T, and a 700-T (my personal gear) for a combined parts price of $106. Plus shipping. The 505-T, if you did all the caps, and it was working before hand, will probably run about $35.00-$40.00 for parts. Say for the sake of arguement that the tech does all of them (and most shops will only do what's minimally necessary to get it out the door) and it runs to 5-6 hours. 75-100 per hour. So $450 to $600 just for labor.
These aren't really hard units to work on. But they DO require dis-assembly of the boards from the wiring in most cases. And for the most part they are soldered to pins. This takes time.
And no, I don't take in outside work. There are AK'er's who will work on gear, and do full up restorations for a lot less than most shops. The problem is you'll have to pack and ship it. BKtheking (Brad), is in Canada. There are others but I don't keep up on them. AK'er Noodle(who's in AL or MS) might take in outside stuff. PM both of them and check.
Larry