As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, RECEIVED A LEVEL 2 CARGO DOOR FWD B ALERT . RAN THE QRH AND THE ALERT REMAINED ON AND RETURNED TO DEPARTURE. R & R THE FORWARD LOWER CARGO DOOR PROXIMITY SENSOR IAW AMM 52-70-01-4. DOOR OPERATED NORMALLY IN OPEN/CLOSE MODE. ELECTRICAL TEST OF THE FORWARD LOWER CARGO DOOR VERIFIED GOOD IAW AMM 52-31-04-700-801. ALL DOOR TEST FROM OVERHEAD IN COCKPIT RETURNED SATISFACTORY TEST ON TWO SEPERATE TESTS. OK FOR SERVICE.