As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AT CRUISE DURING FLIGHT CONFIDENCE FLIGHT, A SULFUR TYPE OF ODOR IN FLIGHT DECK UNTIL MIDDLE OF DESCENT. OPERATED LEFT AND RIGHT PACKS WITH AUXILIARY POWER UNIT AIR AT MULTIPLE TEMPERATURE SETTINGS FOR 3 HOURS PER AMM 21-00-00 . NO ODOR NOTED.