What was found
IN CLIMB, BETWEEN 8000-8500 FT A/P LT ENG MADE LOUD BANG FOLLOWED BY SHUDDERING AND VIBRATION ITT WELL ABOVE 900 DEGREES. BROUGHT LT ENGINE THRUST TO IDLE VIBRATION DAMPENED. ADVANCED ENGINE THRUST, BROUGHT NO ADDITIONAL THRUST RAN IMMEDIATE ACTION CHECKLIST FOR SEVERE ENGINE DAMAGE INFLT. COMPLIED WITH IAC AND QRH PROCEDURE MADE SINGLE ENGINE APPROACH, & LANDING. LT ENGINE WAS REPLACED. PRELIMINARY BORESCOPE NOTED COMPRESSOR DAMAGE. NO FAN DAMAGE WAS NOTED.