What was found
(CAN) WHILE PERFORMING A SCHEDULED BOROSCOPE INSPECTION OF THE LT ENGINE COMPRESSOR BLADES, VARIABLE GUIDE VANES AND STATIONARY VANES IAW TASK RJ2-72-430-107, THE AME FOUND THE STAGE 9 COMPRESSOR HAD SEVERAL BLADES MIGRATING AT THE ROOT AT THE AFT SIDE OF THE PLATFORM. THE 9TH STAGE ROTOR WAS REMOVED FOR A CLOSER INSPECTION. A TOTAL OF 21 OF THE 88 BLADES ON THIS ROTOR WAS FOUND WITH CRACKS AT THE DOVETAIL WITH 1 COMPLETELY BROKEN OFF. THE BLADES HAVE 3190 CYCLES AND 4234 HOURS SINCE O/H. THIS 9TH STAGE HAD A MIXTURE OF NEW AND O/H BLADES DURING THE LAST SHOP VISIT. THE ACTUAL BLADE TIMES ARE NOT TRACKED. THE BLADES WERE O/H BY THE MFG. ALL OF THE BLADES ON THIS ENGINE CONFORMS TO THE LATEST STANDARD WHICH IS POST SB72-0130 THIE FREQUENCY OF THIS BOROSCOPE TASK IS 5000 HRS. WE HAVE REPLACED THE ALL OF THE STAGE 9 BLADES ON THE WING. THE REMOVAL AND REPLACEMENT OF THESE BLADES WAS PERFORMED. ALL THE BLADES THAT HAVE BEEN REMOVED WILL BE SHIPPED FOR LAB ANALYSIS.