As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT OF MEM, GEAR DOOR OPEN LIGHT CAME ON. FOLLOWED COM PROCEDURE AND LIGHT REMAINED ON. RECYCLED GEAR AND LIGHT REMAINED ON. FLIGHT RETURNED TO MEM AND LANDED WITHOUT INCIDENT. REPLACED LEFT GEAR DOOR SWITCH. OPERATIONAL CHECK OK.