As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4834 CREW REPORTED ON TAKEOFF THAT THE LT LANDING GEAR WOULD NOT RETRACT. CAPTAIN ELECTED TO RETURN TO FIELD. ACFT REMOVED FROM SERVICE. PERFORMED CMC DOWNLOAD REMOVED AND REPLACED LANDING GEAR NR1 DOWN LOCK (A) PROXIMITY SWITCH IAW EMB AMM 32-61-02. OPERATIONAL CHECK GOOD. ACFT RETURNED TO SERVICE. (S)