As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN AND FLIGHT DECKHAVE STRONG ODOR OF POSSIBLE TOXIC FUMES FOUND THAT THE SMELL WAS FROM THE APU BLEED. REPLACED BOTH RECIRCULATION FILTER CARTRIDGE REF AMM 21-21-41. RAN BOTH ENGINES FOR PACK BURN OFF AND REPLACED BOTH FILTERS AGAIN. SMELL NO LONGER PRESENT. APU BLEED SYSTEM PLACED ON MEL REF LOGPAGE 6599602