As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
*AIR TURN BACK* FWD CARGO DOOR EICAS MSG ON DEPARTURE. WHILE TROUBLESHOOTING FORWARD LOWER CARGO DOOR INDICATION FOUND CONNECTOR D6266P NOT LOCKED. LOCKED CONNECTOR PER SWPM20-61-00. PERFORMED DOOR SENSOR TEST PER AMM52-71-00-735-072 AND DOOR WARNING INDICATION AND SENSOR TESTS PER AMM 32-09-03/001. ALL TEST PASS THIS CLEARS DEFERRAL. DEFERRAL CLOSED AND SDR COMPLETED BY DRC.