i have a n35zr-16.5 that i removed the drive motor/drive unit to swap the drive unit with one from an identical parts truck we have. i also removed the steer motor when pulling the drive motor. everything went back together fine but now i have no hydraulics. unit says hydraulics disabled on dash. i went into the diagnostic system and performed the static diagnostic and under "steer ok" it says i have a fault. i tried replacing the motor and steer controller with the parts truck and found no change. also found a pinched wire going from the steer motor to the controller. repaired the wiring and still no change. any ideas on what next to do?