As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CARGO DOOR UNLOCK LIGHT ILLUMINATED IN FLIGHT, LIGHT EXTINGUISHED AFTER LANDING. CLEANED MAIN CARGO DOOR LOCKS AND SWITCH PERFORMED OPERATIONAL CHECK IAW B737-800 IAI SUP MANUAL 52-32-00. MAIN CARGO DOOR OPS CHECK GOOD NO DEFECTS NOTED AT THIS TIME