What was found
STA: ILN, ON CREW PREFLIGHT, SMOKE DETECTED IN COCKPIT. ALSO EICAS SCREEN AND LEFT FMC BLANK. REMOVED UPPER EICAS DISPLAY UNIT AND LEFT FMC DISPLAY UNIT. INSPECTED WIRING AND CONNECTORS, NO DEFECTS NOTED. REMOVED AND REPLACED EICAS DISPLAY UNIT AND LEFT FMC. BOTH UNITS CHECK GOOD IAW B767 MM. LEFT FMC REMOVED: P/N: 4038170-905, S/N: 84040157, TSSV: 1001, CSSV: 243.