As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT JB1224 LGB-PDX FLIGHT FROM LONG BEACH TO PORTLAND OREGON DIVERTED TO OAK DUE TO ENGINE NR 1 FIRE DETECTION FAIL MESSAGE DURING CRUISE. PERFORMED QRH PROCEDURES AND LANDED UNEVENTFUL. INSPECTION OF NR 1 ENGINE FOUND LOW PRESSURE TURBINE BLADE DAMAGE LPT STG 4 ONE BLADE BROKEN OFF AND NUMEROUS OTHERS BENT. REMOVED AND REPLACED NR 1 ENGINE IAW TASK CARDS IN WO 62524 PER AMM1 71-00-01-000-801 AND 71-00-01-400-801. ACCOMPLISHED RUN UPS AND OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.