As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/E O2 REG INOP. *S/D* REMOVED AND REPLACED 02 REG BACKGROUND LIGHTS INOP. FOUND WIRES BROKEN BEHIND FE'S OXY GEN REGULATOR. REPAIRED WIRES WITH REF TO BOEING STD WIRING PRAC MANUA L 20-10-13. LIGHTS OPERATED NORMAL AND PLACARD REMOVED. THIS CLEARS M297824.