What was found
LEFT FMC FAILED SEVERAL TIMES AND THEN RECOVERED. THE THIRD TIME IT FAILED IT DID NOT RECOVER. ACFT GROUNDED. CONFIRMED FAULT, LT FMC SHOWS FMC FAULTS. REMOVED & REPLACED THE LT FMC IAW AMM 34-61-02, SOFTWARE CROSSLOAD ACCOMPLISHED IAW AMM 34-61-00-470-806. ACCOMPLISHED FMCS PERFORMANCE FACTORS ADJUSTMENT (DRAG FACTOR) IAW AMM 34-61-00-800-801 & FMC SOFTWARE CONFIGURATION CHECKED IAW AMM 34-61-00-750-801, OPS CHECKED NORMAL. POSITIONED FMC SOURCE SELECT SWITCH BACK TO NORMAL POSITION.