What was found
UPON DEPARTURE, SET MY POWER TO ROUGHLY 34.5 TORQUE & AFTER ROTATION, ATTEMPTED TO ADD MORE POWER. WHEN ADDED MORE POWER NOTHING HAPPENED & TORQUE STAYED AROUND 34.5 AND THE ITT STAYED AROUND 680. PLACED PCL FULL FORWARD AND POWER NEVER INCREASED. AT THAT TIME IINCREASED RATE OF CLIMB & LET ATC KNOW WAS GOING TO RETURN TO AIRPORT. HAD SUFFICIENT ALTITUDE AND PREPARED FOR AN EMERGENCY IF NECESSARY. LANDED WITH OUT ANY ISSUES & MX WAS IMMEDIATELY CONTACTED ABOUT THE REDUCED POWER. REMOVED AND INSTALLED NEW P3 AIR FILTER, REMOVED AND INSTALLED NEW COMPRESSOR BLEED VALVE,