As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT LEVEL 330, FLIGHT CREW NOTED AN ACRID ODOR IN COCKPIT THAT THEN TRAVELED BACK TOWARDS THE MID CABIN. ODOR DISSIPATED AND NEVER RETURNED. FLIGHT UNEVENTFULLY LANDED AT DESTINATION. ON INSPECTION, MAINTENANCE FOUND THE ACM HAD SEIZED. MAINTENANCE REPLACED THE ACM AND CLAMP, PERFORMED A SUCCESSFUL LEAK CHECK AND RETURNED THE AIRCRAFT TO SERVICE.