What was found
MSP - FL 856 - AFTER TAKEOFF FROM MSP, THE NR 2 ENGINE EGT BEGAN TO RISE AND THE EPR STARTED TO DROP. DURING CLIMB, CAPTAIN HAD TO KEEP PULLING THE NR 2 THROTTLE BACK TO KEEP EGT WITHIN LIMITS. WHEN FLIGHT LEVELED OFF WITH POWER REDUCED TO LET THINGS STABILIZE, ALL ENGINE INDICATIONS APPEARED ALMOST NORMAL AS COMPRED TO NR 1 ENGINE. WHEN POWER WAS ADDED AGAIN, EGT STARTED RISING RAPIDLY. FLIGHT RETURNED TO FIELD AT MSP. NO EMERGENCY WAS DECLARED AND THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. THE NR 2 ENGINE WAS NOT SHUT DOWN. MAINTENANCE REMOVED AND REPLACED THE NR 2 ENGINE PRESSURE RATIO BLEED CONTROL VALVE. OPERATIONAL CHECK GOOD. RAN ENGINES. ALL PARAMETERS NORMAL. (M)