As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, THE LEFT GEAR UNSAFE LIGHT REMAINED ILLUMINATED. FOLLOWED COCKPIT OPERATING MANUAL PROCEDURE, RECYCLED GEAR. FLIGHT RETURNED TO ATL AND LANDED WITHOUT INCIDENT. FOUND DOOR SWITCH CANNON PLUG BAD AND BROKEN WIRE TO UPLATCH SWITCH. REPLACED CANNON PLUG AND REPAIRED BROKEN WIRE. GEAR OPERATION AND INDICATION CHECKED NORMAL.