[amsat-bb] G-5400B Rotor / Elevation not working

I have a Yaesu G-5400B and the elevation side of the control box seems to have stopped working. The actual elevation rotor has also stopped responding as well. I hooked up a working elevation rotor to test and didn't get any response out of it. Has anyone experienced this or know of something I should look before before I start tracing the schematic?

Please respond to me directly unless the list thinks this question warrants it's own thread.

73 Bobby KF4GTA