What was found
DURING ENG COAST DOWN, UNUSUAL NOISE WAS HEARD. ROTATION OF FREE TURBINE WAS NORMAL, COMPRESSOR ROTATION WAS ROUGH. SUSPECTED REAR BEARING, BUT DID A BORESCOPE TO CHECK TURBINE WHEELS AND NOZZLES. FOUND CRACK IN 2ND STAGE GAS GEN STATOR/NOZZLE OUTER RING. REMOVED ENGINE. REMOVED NRS 2 AND 3. REMOVED REAR BEARING HOUSING AND ROTATED COMPRESSOR. ROUGHNESS WAS GONE. REINSTALLED REAR BEARING AND ROUGHNESS CAME BACK. FOUND SEVERAL MORE CRACKS ON TURBINE NOZZLE. REPLACED 2, 3 MODULES. NG CYCLES 3040. PT CYCLES 3526.