As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT ATTENDANT STATED THAT SPARKS AND A BURNING ODOR HAD BEEN OBSERVED AT THE PSU AREA ABOVE SEAT 14 KJ. INSPECTED AND FOUND A 3 WIRE BUNDLE OF WHAT I ESTIMATE TO BE 22 TO 24 GAUGE WIRE. ONE WIRE IN THE BUNDLE HAD SHORTED BY CONTACT WITH A FASTENER HEAD ABOVE THE PLASTIC COVERING OF THE OXYGEN MASKS,