As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW O2 READS 40 PSI ON EICAS. VERIFIED BOTH O2 BOTTLES ARE OPENED AND PRESSURE ON BOTTLES ARE AT 1600 PSI EACH.(<P>TRANSFERRED TO DMI # 147139 IAW MEL 35-11-02-01. CAT "B" DUE 21MAY21. PLACARDS INSTALLED. VERIFIED BOTH O2 ARE ON AND BOTH BOTTLE AVERAGE IS 1600 PSI. T/I: DL 0522Z.</P><P>19MAY21, AMS MX: LP 1464799, ITEM 1: REPLACED AVERAGING UNIT PER AMM 25-11-06. REVERSED MEL PROCEDURES, ALL INDICATION RETURNED. DMI 147139 CLOSED. MCC RG 14:35Z, DISP DP 1441Z</P>)