I'm happy to report that the open heart surgery I had to do on my Umax Powerlook III scanner was a complete success... the patient expects a full recovery.
Tools used: phillips head screwdriver, syringe, oil can and pliers. The problem was the electric motor had rusted up like the Tin Man. I find that often when scanners don't work it's got to do with needing a little lubrication on the moving parts.
Hopefully it'll keep on working, since I don't feel inclined to toss another $1500 out on a new one. The trusty Umax Powerlook III gives stunning deep rich color scans which are better than many current new scanners.