What was found
DURING CLIMB-OUT AT APPROXIMATELY 6,500 FT THE CREW RECEIVED A RED FLAG ON THE LT INTERSTAGE TURBINE TEMPERATURE GAUGE OF APPROXIMATELY 886 DEGREES. THE CREW REDUCED POWER SLIGHTLY ON THE LT ENGINE WITH THE TEMPERATURE RETURNING TO NORMAL, THEN INCREASED POWER SLIGHTLY AND THE RED FLAG RE-OCCURRED INCLUDING A SLIGHT VIBRATION. QRH PROCEDURES WERE COMPLIED WITH AND THE CREW SHUT DOWN THE LEFT ENGINE. AN EMERGENCY WAS DECLARED AND EMERGENCY EQUIPMENT REQUESTED. THE AIRCRAFT RETURNED TO ATL, LANDING SAFELY. MAINTENANCE REMOVED AND REPLACED THE LEFT ENGINE. OPERAITONAL CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (M)