Vacuum tube tester repair

Do any of you virtual peoples out there know of any one who repairs Hickok tube testers, specificly the ones made for Western Electric? I'm a techhead, but I would have to take up methamphetimines before even considering trying to fix this problem. Everything is working except it won't measure pentodes correctly. A wire was broken off a switch pole and I soldered it back to where it looked like it went. Maybe not. This thing has about a 1/4 mile of wiring, custom made switches, and schmatic that looks like one of those optical illusion drawings.