What was found
PDX - NR1 ENGINE FAILED SCHEDULED BORESCOPE INSPECTION. FOUND FOUR MISSING BLADES AND SIX BLADES HAVE TRAILING EDGE DAMAGE. REPLACED ENGINE. AIRCRAFT OPERATIONAL CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. ENGINE UNDER INVESTIGATION AT GE. INVESTIGATION BY THE ENGINE MANUFACTURER (GE) HAS BEEN COMPLETED. IT HAS BEEN CONCLUDED THAT MODIFICATION TO THE HPT1 DAMPNER (ALONG WITH RE-WORK OF THE ACCELERATOR) IS THE CORRECTIVE ACTION FOR THE REMOVED ENGINE. A PLAN HAS BEEN DEVISED TO INCORPORATE THIS MOD IN THE NEXT FEW QUARTERS.