As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, DURING GEAR RETRACTION LEFT MAIN GEAR RED IN TRANSIT LIGHT REMAINED ILLUMINATED, CAPTAIN PERFORMED ALTERNATE EXTENSION OF GEAR. REMOVED AND REPLACED LEFT GEAR UPLOCK ACTUATOR IN ACCORDANCE WITH -8 MM 32-30-26. CYCLED GEAR SEVERAL TIMES IN HANGER. OPERATIONAL CHECKED GOOD.