What was found
(CAN) AIRCRAFT RETURNED TO BASE AFTER PILOT OBSERVED HIGH ITT INDICATION. AIRCRAFT WAS GROUND RUN AND ENGINE PERFORMANCE INDICATED COMPRESSOR OR COLD SECTION PROBLEM WITH THE ENGINE. ENGINE WAS GROUND RUN AGAIN WITH HEATER IN GROUND MODE WHICH USES BLEED AIR FROM THE BLEED VALVE FOR HEAT ON THE GROUND. THERE WAS NO INDICATION OF THE BLEED VALVE CLOSING AT ITS REQUIRED POWER SETTING. THE COMPRESSOR BLEED VALVE WAS REPLACED AND GROUND RUN PERFORMANCE WAS RESTORED AND THE AIRCRAFT RETURNED TO SERVICE.