What was found
AT CRUISE VTK DISPLAYED ON CAPT MAP DISPLAY BOTH CDU'S FAILED FOLLOWED CHECK LIST FOR LEFT FMC FAILURE SELECTED FMC SWITCH TO BOTH ON R VTK WARNING WENT OUT CDU'S WERE OPERATIONAL. PERFORMED FMC BITE REF FIM 34 61 TASK 801 SENSOR STATUS SHOWS L FMC PASS HOWEVER INFLT FAULT SHOWS (L) ON FLT (G) ALONG WITH (B) FOR FLT 1 & 2. RIGHT FMC CONFIRMS FAULT FOR LEFT FMC ON FLT 1 & 2. REPLACED NR 1 FMC (LEFT) PER MM 34 61 02, INSTALLED SOFTWARE PER MM 34 61 00, SYSTEM OP CHECKS GOOD PER MM 34 61 00.