As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, LT ENGINE WAS REDUCED DUE TO IMPENDING HIGH EGT (576°C), THE BEHAVIOR OF THE LEFT ENGINE WAS NORMAL UNTIL CLIMBING, THROUGH APPROXIMATELY FL 280, A STRONG STALL NOISE WAS FELT WITH AIRCRAFT YAWING. LT ENGINE EPR WAS DECREASED AND EGT ROSE UP. ENGINE WAS REDUCED TO IDLE UNTIL LANDING. FLIGHT RETURNED TO PTY. CHECK PROCEDURES WERE ACCOMPLISHED IAW AMM 72-00-00 AND FUEL CONTROL WAS REPLACED. ENGINE STALL DURING TEST. LT ENGINE WAS REPLACED.