What was found
MAIN CARGO DOOR FAILED TO OPEN. OPENED MANUALY. NOW MAIN CARGO DOOR FAILED TO CLOSE. IN THE PROCESS OF PREP TO R & R LIFT DRIVE ACTUATOR FOUND AFT RATCHET ARM CRACK AS SHOWN IN ATTACHED IDENTIFIED PARTS, MPN: 258T5212-3, QTY: 1, ACCOMPLISHED HFEC OF AFT RATCHET ARM SUSPECTED CRACK REF NTM 51-00-21, PART 6. NO DEFECTS NOTED. PART WAS NOT CRACKED.