A few thoughts:
- With power off, pull and reseat all the boards from the control. You may have to do this a few times.
- I'm not sure if you have taps on the transformer in your machine, but if the axes were tuned on 208 Vac and you are now on 240 Vac, it's possible your lag settings are off.
- Is the machine properly grounded to the panel?
- Are all the terminals, connector pins, connectors, switch blocks, etc secure and tight?
- Any chafing of the wires?
- Any possibility that a metal chip landed on a circuit board?

RT