As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
'GEAR DOOR OPEN' AND 'LEFT GEAR UNSAFE' LIGHTS ON AFTER GEAR RETRACTION. ABNORMAL PROCEDURES PER QRH 5-2, 5-5 PERFORMED. RETURNED TO RENO PER FLIGHT CONTROL. PER MAINTENANCE REQUEST PERFORMED UPLATCH CHECK: LEFT GEAR DOOR OPENED. REMOVED AND REPLACED LEFT MAIN GEAR DOOR ACTUATOR ASSEMBLY. OPERATED GEAR SEVERAL TIMES: ALL OPS NORMAL PER MM 32-32-02. (X)