TR Air Cond. Compressor rebuild?

My TR's air conditioning compressor/pump went bad, or so I believe. To repair a gas tank I had to disconnect the AC. Since I don't mind hot weather I never got around to recharging the system....but I did hook everything back up. After a couple of weeks the compressor starts making a clattering sound like a bad lifter. I removed the compressor to take it to get checked out and repaired. But again I've procrastinated since having AC isn't crucial for me. The time has finally arrived to where I need to get the pump checked out. It is a Sanden unit I think, my car is a 1987 TR. Does anyone have an approximate idea what I can expect to pay for a rebuild of this pump? I assume it went bad because I ran the car without a charge in the AC system and the pump starved for lubrication?

 

Thank You Steve.....my TR's new owner wanted to know what kind of repair bill he is looking at. He will be picking up the car in about two weeks. I'm a little sad to see the ol'e girl go....but looking forward to my next Testarossa. Hopefully I have better luck with the next one.

 

Steve, the compressor is off the car and I was assuming it could simply be sent in for refurbishing.