As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - NR 1 ENGINE FAILED SCHEDULED BORESCOPE INSPECTION. FOUND ONE BLADE BROKEN OFF. REPLACED ENGINE. AIRCRAFT OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. ENGINE UNDER INVESTIGATION AT GE. NVESTIGATION BY THE ENGINE MANUFACTURER (GE) HAS BEEN COMPLETED. IT HAS BEEN CONCLUDED THAT MODIFICATION TO THE HPT 1 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.