What was found
AIRCRAFT WAS GROUNDED. CLIMBING THROUGH 36,000 TO 38,000 IN MANAGED SPEED AUTOPILOT 2 ON COST INDEX 70, MANAGED SPEED COMMANDING APPROXIMATELY 250 KNOTS. AUTOPILOT AND AUTOTHRUST ALLOWED AIRCRAFT TO ACCELERATE TO BARBERPOLE AT APPROXIMATELY 260 KNOTS. DISCONNECTED AUTOPILOT, INCREASED PITCH TO PREVENT VMO - NOTED 7,100 FPM CLIMB. AUTOTHRUST DID NOT REDUCE THRUST UNTIL LEAVING 38,500FT. 38,000 SET IN MCP- AUTOTRHUST ON. AS POWER REDUCED, RELAXED CLIMB AT 39,200 FT. RESUMED LEVEL FLIGHT AT 39.000. REMOVED AND REPLACED NR 2 FLIGHT MANAGEMENT GUIDANCE COMPUTER, IAW AMM 22-83-34.