Did you resolve this?
Sounds like its tilted. Check to see if machine is physically tilted.
...at the tilt mech.
Is the ball in the tilt mech stuck against the tilt switch?
Is the bob (or bob wire) stuck to the hole of the tilt mech?
make sure T relay & Q relay are doing what they are supposed to when pulled in and when released
Something might have been bumped and switches are not proper.
...then I'd check the A3 driver board. Q2 and Z1
Any corrosion on MPU?