As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED A STRONG ODOR IN THE COCKPIT AND AROUND ROW 9 WHICH LASTED 10-15 MIN THEN DISAPPATED WHILE IN CRUISE. AIRCRAFT GROUNDED. MAINTENANCE FOUND THE AVIONICS VENT FILTER CLOGGED, REPLACED THE FILTER AND ACCOMPLISHED A SATISFACTORY OPS CHECK IAW AMM 21-26-43-400-003A AND TASK CARD 26L00021001.