What was found
DURING CRUISE, FLT AT F340-CPT MAP SCREEN BLANKS. CAPT FMC SHUT OFF. F/O MAP SCREEN BLANKS. A/P DESCENT AUTO THROTTLES DSC . ACFT CLIMBED AND BANKED MCP BUTTONS STOPPED DID NOT RSPND. EFIS CTL . F/O NAV DATA AND FLT PLAN DISAPPRD FROM SCREEN. NUMEROUS CAUTION LEVEL EICAS MSGS APPEARED. MCP EVENTUALLY RESPONDED RT A/P ENG D-A/T WERE SLOW TO ACTIVATE WITH MULTPLE SPEED BUTTON PRESSES ACTIVITIES. WHILE HAND FLYING EICAS MESSGES DISAPPEARED. TOMC+DISP CONSLTED . CRW DIVERTED. OVWT LNDING... CAPT MAP SCREEN BLANKS AND FMC SHUT OFF SUPECTING INTERMITTEN FAULT, REPLACE FMC LT AS A PRECAUTION. TEST 30 & 40 CARRIED OUT IAW FIM 22-03 FT818 AND FT821 TEST PASSED FMC LT R & R IAW AMM 34-61-01/401, ALL 3 AUTOLAND TEST CARRIED OUT IAW FIM 22-03 FT821 WITH ALL 3 PASSED. AUTOLAND STATUS RETAINED TO FULL CAPABILITY. A-T TESTED PER FIM 22-03 FT810 TEST PASSED L FMC COMPUTER TO BE REPLACED DUE TO FMC ISSUES X-REF LP 9848769 COMPUTER, FLT M OFF 19-3461-9-0004 8249 ON 19-3461-9-0004 4719 COMPUTER, FLT M OFF 19-3461-9-0004 8249 ON 0000 L FMC REPLACED IAW AMM 34-61-01 SATISFACTORY. SOFTWARE VERSIONS VERIFIED SATISFACTORY