As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AIRCRAFT 651, L/P 1354557) PSU O2 DOOR LOOSEMASK FELL DURING T/O / INTERIOR / LOCATION: 7D. CORRECCTIVE ACTION: OPENED PSU 02 PANEL AT SEAT LOCATION 7D. 02 GEN IS NOT FIRED AND PIN ENGAGED. REPACKED MASKS AND STOWED PANEL AND LATCHED PER B757 AMM 35-21-05-402-001-003. CHECKS GOOD AND OK FOR SERVICE.