As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUMES IN COCKPIT/CABIN LED TO DIVERSION. APU OFF/BLEEDS ON ENGINES/SMELLED LIKE CIGARETTE BURNING/NO VISIBLE SMOKE. PERFORMED GROUND RUNS WITH BLEEDS ON ENGINES AND APU NO FUMES OR SMOKE NOTED. PER 71-00-00 OPS CHECKED 1 AND 2 PACKS PER 21-50-00 OPS GOOD.