As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, AIRCRAFT DEVELOPED A SOUND SIMILAR TO A WHINE AND CREWMEMBERS IMMEDIATELY SMELLED BURNING. TROUBLESHOOTING FOUND COCKPIT BLOWER MOTOR CAUSING WHINING SOUND IN HEADSET. REMOVED AND REPLACED COCKPIT BLOWER ASSEMBLY IAW AMM 21-22-00, 4-3. MOC OK.