As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB PASSING FL250, BANG FROM NR 1 ENGINE ALONG WITH SHUDDER. EGT PEAKED 898 DEGREE C. INDICATION RETURNED TO NEAR NORMAL AFTER EVENT. BOROSCOPED NR 1 ENGINE (SN 706222) STAGE 12 BLADES DAMAGED BEYOND LIMITS. ENGINE CHANGE IN PROGRESS.