As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - SHORTLY AFTER TAKEOFF LEFT MAIN GEAR DOOR ADVISORY LIGHT REMAINED ILLUMINATED. EXTENDED GEAR USING ALTERNATE LANDING GEAR EXTENSION SYSTEM. MX REMOVED AND REPLACED LEFT AND RIGHT MLG DOOR SOLENOID SEQUENCE VALVE. NO DEFECTS NOTED PER AMM 32-31-41-04.