What was found
CAPTAINS MASK HAS LEAK. SWAPPED CAPTAINS & OBSERVERS MASK IAW AMM 35-11-12, MASK & MIC CHECKED GOOD. DEFERRED OXY SYS FOR OBSERVERS IAW MEL 35-10-1. ENTERED IN MM02, PLACARD INSTALLED, MXC NOTIFIED 51021 CAT A. REFER TO CNTL 3283680-1 FOR SEAT DEFERRAL. R & R OBSERVER’S OXYGEN MASK IAW AMM 35-11-12. OPERATIONS TEST OF MIC, LEAK TEST, OPS TEST OF CREW OXYGEN SYS GOOD. CLEARED FROM MM02, PLACARD REMOVED, M ACTIONS REVERSED, MXC NOTIFIED 96579.