As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACRID SMELL IN COCKPIT THAT EVENTUALLY WENT THROUGHOUT CABIN. REMOVED AND REPLACED RECIRCULATION FILTERS REF AMM 21-21-41 AS REQUESTED BY TOMC. OPERATED APU AND APU BLEED SYS. ALSO OPERATED BOTH ENGINES AND ENG BLEED SYS. NO ODORS NOTED IN FLIGHT DECK, CABIN OR ELECT COMPARTMENTS.