As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION, HEARD A FAINT GAS LEAK IN OVERHEAD. PULLED O2 OUTLETS IN SUSPECTED AREA, AND CHECKED B-NUTS, ALL SECURE. PULLED HEADLINER FOR A CLOSER INSPECTION. FOUND O2 LINE JUST FWD OF THE CABIN DOOR CORRODED AND LEAKING. CORROSION ON THE LINE OCCURRED WHERE THE DUCTING PASSED UNDER IT. EVERYWHERE THIS DUCTING TOUCHED AN O2 LINE THERE WAS CORROSION. THE LINES & FLEX DUCTING WAS REPLACED WITH NEW. (K)