What was found
(CAN) DURING DESCENT, CREW NOTICED FOLLOWING INDICATORS ON RT ENGINE INSTRUMENTS. TORQUE HAD DROPPED TO ZERO, NG HAD FALLEN TO 66 PERCENT & ITT APPROX. 800 DEGS. ALL OTHER ENGINE PARAMETERS WERE NORMAL. AS POWER LEVER ADVANCED IN ORDER TO INCREASE NG ITT WOULD RISE IMMEDIATELY. AS RESULT NR 2 ENGINE SHUTDOWN. UPON SUCCESSFUL COMPLETION OF EMERG LDG, MAINT ADVISED. INIT INSP OF ENGINE AIR INTAKE, EXHAUST&FUEL&OIL FILTERS REVEALED NOTHING. FCU, BLEED VALVE & CAPPING OF PY LINE WERE CARRIED OUT AS RECOMMENDED BY MFG WITH NO SUCCESS.