What was found
AIRCRAFT WAS GROUNDED: CMD A AP ON, CA F/O ON DURING DESCENT FO AIRSPEED REF BUG INCREASED AND SEPARATED FROM CA STBY A/S INDICATIONS FO INDICATION INCREASED TO VMO. FO A/S INDICATION RETURNED TO MATCH CA STBY INDICATION WHEN VNAV PATH DISENGAGED BY SWITCHING TO LVL CHG . REPLACED FLIGHT CONTROL COMPUTER A AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK, PER AMM 22-11-33 (AALA202008219017). REPLACED FLIGHT MANAGEMENT CONTROL SYSTEM TRANSFER RELAYS R475 (AALA202009229018) AND R475 (AALA202009229019). ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK, PER AMM 34-61-04,