What was found
WHEN LINE-SERVICE OPENED THE MAIN ENTRY CABIN DOOR HE HEARD A LOUD POP. UPON INSPECTION, FOUND THAT THE MAIN ENTRY DOOR SECONDARY LOCKING MECHANISM FAILED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
WHEN LINE-SERVICE OPENED THE MAIN ENTRY CABIN DOOR HE HEARD A LOUD POP. UPON INSPECTION, FOUND THAT THE MAIN ENTRY DOOR SECONDARY LOCKING MECHANISM FAILED.