As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKE-OFF, A FORWARD CARGO DOOR OPEN INDICATION ILLUMINATED. DECLARED AN EMERGENCY AND RETURNED TO DEPARTURE AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND BACK SHELL LOOSE, TIGHTEN BACK SHELL AND SAFETY TIED, CLEANED SENSOR AND CHECKED FOR BREAKAGE ON SENOR WIRE IAW AMM 52-71-12. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK.