As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DECENT SMOKE ALARM CAME ON, NO VISIBLE SMOKE BUT THERE WAS A VERY STRONG ODOR. TURNED OFF RECIRC AND GASPER FANS AND ALARM QUITE. PERFORMED GROUND OPERATIONAL CHECK OF AIRCRAFT SYSTEMS WITH APU AND ENGINE BLEEDS ON AND OFF FOR ABOUT 40 MINUTES, COULD NOT DUPLICATE