As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERMITTANT STRONG CHEMICAL ODOR COMING FROM CAPTAIN`S VENT. CLOSING THE VENT REDUCES ODOR. MAINTENANCE FOUND ODOR COMING FROM LOWER RECIRCULATION FILTERS. REPLACED THE FILTERS IAW MM 21-25-08. ODOR IS NOW GONE, OK FOR SERVICE.. THE AIRCRAFT WAS GROUNDED.