What was found
CAPT O2 MASK NOT WORKING PROPERLY, EXTREMELY HARD TO BREATHE THROUGH, NEEDS TO BE REPLACED.(<P>SWAPPED O2 MASK WITH LEFT OBSERVERS. LEFT OBS SEAT UNUSEABLE. PART # INSTALLED CAPT POSITION NOW MC10-08-109 S/N 19290. CURRENT OBS MASK P/N MC10-08-109 S/N 73962.</P><P>ITEM #2: TRANSFER TO MDDR 146898, MEL 35-11-03, CAT C, DUE 23MAY21.</P><P>LP 1478064 ITEM #4: REMOVED AND REPLACED L OBSV OXY MASK PER AMM 35-11-51, OPS CHECK GOOD, THIS CLEARS DMI 146898.</P><P><BR /></P>)