What was found
(CAN) SUBJECT ENGINE WAS REMOVED FROM ACFT TO ADDRESS MULTIPLE HPC DAMAGED BLADES ON STAGES 1 THROUGH 9. DURING THE INVESTIGATION TO DETERMINE THE CAUSE OF THE BLADE DAMAGE, IT WAS NOTED THAT QTY 1 STAGE 1 BLADE WAS LOOSE AND FREEDOM OF MOVEMENT FORE-AFT WAS OBSERVED OF THE BLADE IN ITS DOVETAIL RETAINING SLOT. THIS IS INCONSISTENT WITH A PROPERLY RETAINED BLADE THAT IS SECURED IN ITS SLOT AND CANNOT BE MOVED BY HAND DUE TO THE RING`S LOCKING FEATURE. FURTHER INVESTIGATION USING A MIRROR AND FLASHLIGHT REVEALED THAT APPROXIMATELY A 1" SECTION OF THE BLADE`S RETAINER RING, PN 9523M11G03 WITH ITS ATTACHED LUG WAS MISSING, ALLOWING THE RING END TO WORK ITS WAY FROM UNDER THE STAGE 1 DISK RETAINING SLOT.