As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT EXPERIENCED A BURNING ODOR IRRITATING TO THE EYES, APPEARS TO BE COMING FROM THE AC PACKS. OPERATED APU AND PACKS FOR 15 MINUTES. VISUALLY INSPECTED PNEUMATIC DUCTS ACM COMPARTMENTS BLEED SYSTEM HEAT EXCHANGER TAIL SECTION AND ELECTRIC COMPARTMENT. NO EVIDENCE OF FIRE OR SMOKE.