As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS INTERMITTENT ELECTRICAL "BURNT" SMELL IN COCKPIT LAST 40 MINUTES OF FLIGHT. NO INDICATIONS ON ELEC PAGE OR SYSTEMS NO CB'S POPPED. MAINTENANCE REMOVED AND REPLACED EXTRACT AVX FAN 18HQ IAW AMM 21-26-51, OPS CHECKS GOOD.