As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUPPORT TASK> PAX O2 MASKS FAILED TO DEPLOY AT SEAT ROW 37R/H AN D 20L/H. TRANSCRIBED FROM NR 9283870, HAECO NR 43870 REMOVED & REPLACED O2 DOOR ACTUATORS AT SEAT ROWS 20 L/H & 37 R/ H IAW UA B757-200 AMM 35-21-06. OPS CHECK VERIFIED GOOD IAW UAL B757-200 AMM 35-21-00 & AMM 25-23-01-404-021 STEP 3.D(9).