As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DISAGREE/NLG UNCOMMANDED MOVEMENT/CABIN ALT INCREASED RAPIDLY. PERFORMED A HEALTH STATUS CHECK OF THE PROXIMITY SENSOR IN THE MDC IAW 32-61-00-710-801 HEALTH CHECK GOOD NO DEFECT NOTED. TROUBLESHOOT NLG IAW SDS 32-30-00-001 AND SSM 32-30-00. SUSPECTED LOCK ACTUATOR TO BE THE CAUSE. REMOVED AND REPLACED NLG LOCK ACTUATOR IAW AMM 32-32-08-000/400-801. SWUNG NLG SEVERAL TIMES AND HELD UP FOR 5 MIN TWICE. FAULT DID NOT REAPPEAR. OPS CHECK GOOD.