What was found
DURING FLIGHT FROM PHL TO SDL, DISCOVERED SULFA SMELL IN COCKPIT AT FL 400 AT ABOUT 2 HOURS INTO THE FLT, DIVERTED INTO ICT. SMELL SEEMED TO OCCUR EVERY FEW MINUTES. COULD NOT DETERMINE ORIGIN. DURING OPERATION OF AIRCRAFT FOUND COCKPIT ACM MAKING A GROWLING NOISE. REMOVED COCKPIT ECU TURBINE TO INSPECT IAW CE 750 MM CH 21-51-00 FOUND TURBINE BLADETIPS ERODED AND CAN FEEL FRICTION WHEN TURNING TURBINE BY HAND AND HEAR A GRINDING NOISE. REMOVED AND REPLAXCED AFT ECU TURBINE IAW CE750 MM 21-51-00