As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - DURING CLIMB, FORWARD EXHAUST COOLING FAN, MFG P/N 732591E, OVERHEATED AND EMITTED SMOKE ELECTRICAL ODOR TO FLIGHT DECK. TURNED OFF COOLING FAN. FOUND COOLING FAN SHAFT BEARINGS WORN. REPLACED FORWARD EXHAUST COOLING FAN AND OPERATION CHECKED NORMAL. (M)