As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW OXY LOW. INDICATED 1560 PSI ON GROUND BEFORE TAKE-OFF. INDICATED 500 DURING CLIMB WHEN WE GOT EICAS MESSAGE.(<P>R/R CREW O2 BOTTLE IAW AMM 12-15-08. BOTTLES PRESERVICED TO 1800PSI, NO LEAKS NOTED. OPS CHECK GOOD. CHANGED DUE TO LOSE B-NUT RESULTING IN TANKS LEAKING TO 0 PSI. </P>)