I took a look at the KBWT-112 controller board and DC motor in the G0704 cabinet. I believe the motor in not working but the controller board is working. The net is that I don't believe the existing pieces will bring this machine back. Also the on/off switch is missing (~$20). I think to bring this machine up as a manual machine we have a couple of options.
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1. Find a DC treadmill motor, use the KBWT-112 controller board and adapt the machine for belt drive with the treadmill motor. Cost about $125.
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2. Get a V3 Grizzly replacement motor, the new ones are reported to be better, and bring the machine back to original shape. Cost abt. $140 + the switch.
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This presumes that no other problems exist.
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I'd be interested to know if this aligns with any other persons experience with this machine.