As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK DUE TO FWD CARGO DOOR LIGHT CAME ON AFTER TAKEOFF. AIRCRAFT MADE AN UNEVENTFUL LANDING. FOUND DOOR SWITCH GROUND STUD LOOSE, MOVED GROUND TERMINAL FROM GROUND STUD NR GD00200A TO NR GD01008D. OPS CHECK GOOD AS PER BOEING MM. (LP 185388)