What was found
UPON ARRIVAL, DURING PASSENGER UNLOADING, ONE OF THE PASSENGERS PULLED THE RED EMERGENCY DOOR RELEASE AND JETTISON THE RT PASSENGER DOOR. WHEN THE COPILOT ATTEMPTED TO CLOSE THE DOOR, HE NOTICED THAT THE DOOR WAS LOOSE AND NOT SECURED. AC WAS SHUTDOWN AND OPS WAS NOTIFIED. THE MECHANIC PUT THE DOOR BACK ON AND SECURED IT IAW MM AND AC WAS RETURNED TO SERVICE. (K)