What was found
CREW DECLARED AN EMERGENCY AND ACFT DIVERTED, AFTER REACHING CRUISE ALTITUDE A STRONG ELECTRICAL BURNING ODOR WAS OBSERVED IN THE COCKPIT. ALSO, HEARD A HIGH PITCHED GRINDING SOUND WITH SLIGHT VIBRATION. DURING SMOKE INSPECTION FOUND FAULT WITH AVIONICS BLOWER 20HQ NOISY. PERFORMED INSPECTIONS REF 05-50-00-810-831-A AND 24-00-00-810-823-A. NO EVIDENCE OF SMOKE AFTER SEVERAL HOURS OF ACFT POWER UP, FOUND 20HQ AVI BLOWER FAN VIBRATION / NOISE. R & R BLOWER 20HQ IAW AMM 21-26-51-000-001-A. OPS CK GOOD.