The first thing that I did was to change the battery. As far as I know there has been no crash in the last year or so. The encoder has been changed.
The Servo does not move while the power is off as far as I can tell. The machine stays in the home position until the servo amp power is restored. As soon as the power is restore the servo motor drives down to the lower over travel proximity switch and faults out. The encoder position reading is -30. You have to manually jog the servo to -29 by selecting the servo counter clockwise button on the HMI. Once the machine has moved away from the switch you can select the servo home button on the HMI. The servo then travels up to the original (home) position.
The maintenance group informed me that this issue occurred with the twin machine a few years back. The controls specialist changed the servo amp out to correct the problem.