As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW INFLIGHT T1304/6 MAR LOUD BAND AND SHUTTER. LEFT ENGINE LOST POWER. ROLLED BACK TO IDLE. ENGINE RAN AT IDLE UNTIL AFTER LANDING. ENGINE WAS SHUT DOWN AFTER LANDING. FOUND METAL IN TAILPIPE. REPLACED NUMBER ONE ENGINE. SYSTEM GROUND CHECKED NORMAL OPERATION.