As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GROUND DISPLAY FAN VERY LOUD ACCOMPANIED BY A BURNING ELECTRICAL ODOR. AFTER TROUBLESHOOTING, FOUND THE NR 2 FAN OF THE AVIONICS DISPLAY UNIT WAS THE CAUSE THE ODOR & NOISE. REMOVED AND REPLACED NR 2 DISPLAY COOLING FAN AND OP CK GOOD IAW AMM 21-24-12.