As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOLLOWING TWO HOURS DE-ICE, ACFT FILLED WITH SMOKE WHEN APPLYING APU BLEED AIR. AFT CARGO SMOKE WARNING ACTIVATED. R & R BOTH WATER SEPARATOR BAGS IAW AMM 21- 51- 16-03. RAN APU & BLEED TO BURN OUT PACKS IAW AMM 21-51-00-03. AFTER BURNOUT OF PACK OF 2 HRS NO SMOKE PRESENT. RAN BOTH ENGS IAW JRH 5 & O SMOKE WARNINGS.