As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE FILLED THE COCKPIT AT TOP OF DESCENT. TURNED AIR CONDITIONING PACKS OFF AND CLOSED ENGINE BLEED AIR VALVES WITH NO EFFECT. SMOKE CLEARED BEFORE LANDING. PERFORMED MAINTENANCE CHECK OF AIR CONDITIONING SYSTEM AND FOUND NR 1 WATER SEPARATOR CONTAMINATED. DEACTIVATED NR 1 A/C PACK AND REACTIVATED NR 2 PACK.