As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE EVENT JUST BEFORE TOP OF DESCENT F/A COMPLAINED OF HEADACHES IN THE BACK OF THE AIRCRAFT-PERFORMED TSM 05-50-00-810-831-A OPS CHECKS OF BOTH PACKS 1&2 APU CHECKS OK COULD NOT DUPLICATE FAULT AT THIS TIME A/C OK FOR RETURN TO SERVICE