As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSENGER EMERGENCY OXYGEN SYSTEM PROBLEM. PASSENGER OXYGEN QUANTITY AT 800 PSI AND DECREASING. *SUPPLEMENTAL DATA UPDATE* A VOLTAGE AVERAGING UNIT INTERNALLY OVERHEATED AND BURNED THE CIRCUIT BOARD, CAUSING FAILURE OF THE PASSENGER INDICATION SYSTEM. THE UNIT WAS REPLACED.