I have a 1968 Constellation IV teardrop-shaped bass(sorry no pics, but she's pretty rough, poor thing

), which I'd like to get functionally restored. By that I mean having the electronics gone through & if possible, made reliable(w/an eye towards keeping it as original as possible or at least nothing done that can't be easily reversed). Any advice is greatly appreciated.
Edit: This one has the fancy electronics- bass/treble booster, G-tuner & distortion, so it's more than I'd want to let the average tech fiddle with(no offense to any 'average' techs out there

).
Edit #2: After a quick trip to
www.voxshowroom.com I determined that my bass is
not a Bill Wyman as I had been told when I bought it(circa '82 or so)but a Constellation IV.