As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FORWARD CARGO DOOR LIGHT CAME ON AFTER TAKEOFF. RETURNED TO EWR. *S/D* FORWARD CARGO DOOR OPEN LIGHT SWITCH WAS FOUND TO BE OUT OF ADJUSTEMNT. THE SWITCH WAS ADJUSTED, AN OPERATIONAL CHECK WAS PERFORMED ON THE CARGO DOOR AND SWITCH TO CONFIRM PROPER OPERATION.