What was found
AFTER CLOSING THE DOORS FOR DEPARTURE, SMELLED ELECTRICAL SMOKE. DISCOVERED SMOKE OF UNKNOWN ORIGIN IN COURIER COMPART & CARGO AREA. APU AUTO SHUTDOWN. NOT SURE IF THE APU SHUTDOWN IS RELATED TO THE SMOKE & ELECTRICAL ODOR. R & R STARTER. OPS CHECK FAIL. T/SHOT WITH TSM. ECB SHOWED STARTER CRKT. R & R CONTACTORS 5KA & 10KA. NO HELP. REINSTALLED ORIGINAL 5KA CONTACTOR. FOUND FUSE 6KA BLOWN. R & R FUSE. TRIED TO START APU & FUSE FAILED AGAIN. R & R FUSE AGAIN. TRIED TO TURN GEARBOX THROUGH STARTER. 0 ROTATION THROUGH STARTER. REMOVED EXHAUST DUCT FROM COOLING FAN & TRIED TO TURN FAN. FOUND FAN WOULD NOT TURN. SUSPECT GEARBOX SEIEZED. R & R APU IAW WORK CARD 4910000-00-00. OPS CHECK GOOD.