As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LT MLG UNSAFE LIGHT AND GEAR DOOR OPEN LIGHT REMAINED ILLUMINATED AFTER TAKEOFF. THE GEAR WAS CYCLED, BUT THERE WAS NO CHANGE IN INDICATION. THE AIRCRAFT WAS RETURNED TO SFO WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE LT MLG ACTUATOR LOWER LINK BROKEN. THE LOWER LINK WAS REMOVED AND REPLACED. A TEST FLIGHT WAS CONDUCTED AND GEAR RETRACTION AND EXTENSION WAS NORMAL.