What was found
ON CLIMBOUT FROM IAH AT STANDARD THRUST -90.6 PERCENT N1- SETTING, THE NR 2 ENGINE N1 INCREASED TO 99 PERCENT MOMENTARILY THEN BACK TO NORMAL. THIS OCCURED SEVERAL TIMES. THE AUTO THROTTLES WERE DISCONNECTED WITH NO HELP - DID NOT TURN OFF PMC'S. STOPPED WHEN THRUST WAS REDUCED - N1 BELOW 90 PERCENT NOW. FLIGHT CONTINUED AND LANDED WITHOUT FURTHER INCIDENT AT CLT. MAINTENANCE REMOVED AND REPLACED THE NR 2 ENGINE PMC PER AMM 73-21-04 WITH NO HELP. REMOVED AND REPLACED THE NR 2 ENGINE MEC PER J/C 03L50673003. OPERATIONAL CHECKS ACCOMPLISHED PER J/C 03L10171001 AND J/C 03L50672010.