As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED DURING CLIMBOUT AFT CARGO DOOR OPEN LIGHT ILLUMINATED. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. PLACARD AFT CARGO DOOR INDICATION PER MEL 52 01A. FLIGHT CONTINUED TO DESTINATION. REPLACED SWITCH 5961 AT DFW ON 07/16/2012. SYSTEM GROUND CHECK NORMAL OPERATION.