As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE NR 1 ENG HAD MULTIPLE DETONATIONS WITH FIRE STREAMING FROM TAILPIPE. ENGINE TORQUE DROPPED FROM 80 PERCENT TQ TO 30 PERCENT TQ. AFTER PL NR 1 WAS PULLED BACK DETONATIONS CONTINUED TO A TOTAL OF 5 OR 6. ENGINE DID NOT SHUT DOWN. REMOVED AND REPLACED LT ENGINE AS PER W/C EX-ATR-72-RAI-002. OPERATIONAL AND LEAKS CHECKS FOUND SATISFACTORY.