As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2351: MECHANIC RIDING IN BACK REPORTED THE NR 1 HYD ACCESS DOOR CAME UNLATCHED AND THEN SEPARATED FROM THE AIRCRAFT. MAINTENANCE REPLACED THE NR 1 HYD ACCESS DOOR BY INSTALLING + RIVETS. CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.