As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT WITH BOTH PACKS AND BLEED SOURCES IN AUTO AND LOW, THE COCKPIT FILLED WITH SMOKE. LEFT SIDE TEMPERATURE CONTROLLER WAS IN AUTO AND FELT COLD. (FLT 5356) OPERATED LEFT PACK WITH APU AND THEN ENGINE BLEEDS FOR 30 MINS. NO ABNORMALITIES NOTED.