As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DECENT AT APPROX 3000 FT, THE FORWARD CABIN ENTRANCE DOOR OPENED. EMERGENCY WAS DECLARED AND THE AIRCRAFT MADE AN UNEVENTFUL LANDING. UPON INSPECTION OF DOOR AND ANNUNICATOR SYSTEM THE FOLLOWING DEFECTS WERE FOUND: 1/ BOTH DOOR HANDLE ANNUNICATOR SWITCHES WERE STUCK CLOSED AND HAD EVIDENCE OF CORROSION AT WIRE ATTACHMENT POINTS.