As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
O2 PANEL INDICATOR READS 1550 WHEN O2 BOTTLE IS FULL, ALSO COCKPIT GAUGE READS 1550. SERVICED CREW BOTTLE TO FULL MID-RANGE RED ON BOTTLE, AND O2 QTY ON CREW SERVICE PANEL OR EICAS WILL NOT READ OVER 1700PSI. QTY READING ABOUT 200PSI LOW. REMOVED AND REPLACED CREW O2 PRESSURE TRANSDUCER WHICH FAILED.