As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) ODOR IN COCKPIT. INVESTIGATION FOUND ODOR ONLY BECAME PRESENT WHEN THE AIR CONDITIONING SYSTEM WAS SELECTED OFF. FURTHER INVESTIGATION FOUND THE ODOR CAME FROM RECENTLY INSTALLED AVIONICS INSTRUMENT COOLING FANS. FANS WERE CHECKED SERVICEABLE. FANS HAD BEEN FITTED IAW EO F406-21-416 ISSUE1. (OTHER CAUSE: ENVIRONMENT ) (CASA NR 510001897)