What was found
AT FLIGHT LEVEL 390, THE LEFT ENGINE INDICATED 742 DEGREES AND A PILOT-ELECTED IN FLIGHT SHUTDOWN OCCURRED. THE ENGINE EXPERIENCED SEVERAL COMPRESSOR STALLS WHILE FLYING THROUGH TURBULENCE CAUSED BY THUNDERSTORMS. *S/D* A BORESCOPE INSPECTION RESULTED IN NO FINDINGS. THE ENGINE WAS REMOVED, IT WAS THEN RUN IN THE ENGINE TEST CELL AND NOTHING WAS FOUND DURING THE PERFORMANCE RUN. THE ENGINE'S COMPRESSOR WAS DETERIORATED BEYOND THE ANTICIPATED LEVEL, BUT NOT BEYOND ACCEPTABLE LIMITS. THE ENGINE WILL BE REFURBISHED DUE TO THE INABILITY TO ISOLATE A SPECIFIC MALFUNCTION.