What was found
(CAN) IN CRUISE AT 22,000 FEET, THE CREW OBSERVED A DROP IN RPM FOLLOWED BY A FIRE WARNING IN ENGINE NR1. THE FLIGHT CREW PULLED THE (E) HANDLE AND DISCHARGED THE (2) FIRE EXTINGUISHER BOTTLES. THE FLIGHT CREW THEN PROCEEDED, AFTER DECLARING AN EMERGENCY. THE AC LANDED SAFELY AND NO OTHER INCIDENT REPORTED. THE COMPRESSOR AND TURBINE INTERCONNECT SHAFT AND COUPLING FOUND DAMAGED CAUSING FREE TURBINE ROTATION. THE QEC WAS REMOVED, SPLIT, INSPECTED AND ALL THE PARTS SENT TO THE ENGINE SHOP FOR INVESTIGATION. (TC NR 20080214006)