As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: NLG SHOCK FAULT ON CLIMB. DECESION MADE TO RETURN TO ORD, NO EMERGENCY DECLARED AND AIRCRFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND NLG PROX SENSOR TARGETS FOR PROX SENSORS 24GA AND 25GA OUT OF ADJUSTMENT AND REPLACED NLG PROX SENSORS 24GA AND 25GA IAW MM 32-31-73.