What was found
DURING ENGINE DISASSEMBLY, AND FOLLOWING REMOVAL OF THE 02 MODULE SPLITTER FAIRING, QTY 43 BOLTS OUT OF 90 WERE FOUND TO BE MISSING/FAILED ON THE 02/07 FLANGE. REMOVAL OF THE 02 MODULE REVEALED DAMAGE TO THE STAGE 6 AND 7 ROTOR PATHS. IN ADDITION, CRACKING OF THE IPC CASES WAS NOTED IN LINE WITH THE STAGE 4 AND 5 ROTOR BLADES. MOD DISASSEMBLY REVEALED HEAVY CONTACT BETWEENT THE BLADES AND THE CASES. DURING DETAIL INSP THE STAGE 4 IPC DISC WAS SEEN TO EXHIBIT HEAVY CRACKING TO 7 OF DOVETAIL POSTS. PN UL27090 SN STDC17571 TSN 19975/4529. THE DISC WILL BE RETURNED TO MFG FOR INVESTIGATION. PROBABLE CAUSE WAS APPARENT LOSS OF LOCATION OF THE IPC CASES.(K)