What was found
FIRST OBSERVERS EMERGENCY O2 MASK INOP(<P>FIRST OBSERVERS SEAT AND EMERGENCY EQUIPMENT TRANSFERED TO MDDR # 151177 PER B 767 MEL 25-11-02-01A CAT A DUE DATE 04 AUG 21</P> / <P>LP 895909 ITEM 5 REINSTALLED FIRST OFFICERS O2 MASK MASK BOX IAW AMM 35-11-51-004-009. REMOVED AND REPLACED O2 MASK ASSY IAW 35-11-51-004-059 AND 35-11-51-404-060. OPS CK GOOD MDDR 151177 CLEARED. MCC NOTIFIED. PLACARD REMOVED </P>)