What was found
ENCOUNTER SMOKE IN THE COCKPIT AT CRUISE FLIGHT LEVEL 330. PERFORMED PROCEDURES IAW AOM VOL 1. UNSCHEDULE LANDNG. FINDINGS AFTER LANDING. MAINTENANCE FOUND UNSERVICEABLE COOLING FAN. ITEM WAS PLACED ON DMI PER MEL 21-33-2, CAT -C- AND AIRCRAFT RETURNED TO SERVICE. REMOVED & RE;PLACED UPPER EQUIPMENT COOLING FAN AND OPS CHECK SATISFACTORY IAW MM 21-58-07, CLEANED DMI IAW COMPANY POLICY, AIRCRAFT "RETURNED TO SERVICE".