What was found
LEFT FMC FROZE. UNABLE TO INPUT COMMAND. LEFT AIRSPEED BUG +/- 30 KNOTS FROM STEP F (7) TO COMPLETION (TEST FLIGHT MANAGEMENT COMPUTER). REMOVED AND REPLACED LEFT FLIGHT MANAGEMENT COMPUTER AS PER AMM 34-61-01-024-001-001 AND AMM 34-61-01-424-005-001 UP TO STEP F (6). ALL SOFTWARE FOR LEFT FMC IS UP TO DATE AND CORRECT. NEW NAV DATA NEEDS TO BE INSTALLED AND ALSO AMM 34-61-01-424-005-001 COMPUTER, FLT M OFF 19-3461-9-0004 9495 ON 19-3461-9-0004 5565 SEE LOG PAGE 827379 FOR NAV DATA INSTALL COMPLIED WITH TEST FLIGHT MANAGEMENT COMPUTER FROM F (7) TO COMPLETION ALL CHECKS GOOD 34-61-01-424-005-001.