As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW NOTICED LOUD NOISE AND DOOR UNSAFE LIGHT ON AT 28,000 FEET. SAFE LANDING MADE. MAINTENANCE FOUND TOP FORWARD CABIN DOOR LATCH HOOK UNATTACHED FOR DOOR. DISASSEMBLED DOOR AND FOUND CLEVIS PIN ON WHICH THE HOOK PIVOTS BROKEN IN HALF. CAUSE OF FAILURE UNKNOWN. INSTALLED NEW PIN, DOOR OPERATED OK. SUBMITTER RECOMMENDS TIME CHANGE OF THIS ITEM. PART INACCESSIBLE FOR INSPECTION.