As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/O'S O2 MASK WILL NOT INFLATE.(<P>SWAPPED O2 MASK FROM #3 PASSENGER SEAT IAW AMM 35-11-00. MASK OPERATED NORMAL (DEFECTIVE O2 MASK PN MC10-25-104, SN 11227). NOW PASSENGER #3 SEAT O2 MASK WILL NOT INFLATE. TRANSFERRED TO MDDR 126495 IAW AMM 25-25-03, CAT D, DUE DATE 29-JUL-20.</P><P>LP 1149897: REMOVED AND REPLACED OXYGEN MASK IAW AMM 35-11-51. THIS CLEARS MDDR 126495.<BR /></P><P><BR DATA-TEMP="1" /></P>)