As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO MCO DUE TO AN AFT CARGO DOOR OPEN INDICATION ILLUMINATED IN FLIGHT. THE AIRCRAFT LANDED SAFELY AT MCO WITHOUT FURTHER INCIDENT. MAINTENANCE CARGO DOOR PROXIMITY SENSOR 32KWV AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK.