As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT RETURNED TO MIA ACCOUNT ON OF AFT CARGO DOOR OPEN INDICATION. EMERGENCY DECLARED DUE TO OVERWEIGHT LANDING. FLIGHT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED PROX SWITCH-FRAME (32WV) IAW AMM 52-71-12. OPS TEST OK.