As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN CLIMB AND AT LEVEL 34K AND THROTTLING BACK TO CRZ POWER THE LEFT ENGINE HAD A LOUD POP WITH LOSS OF THRUST WITH ENGINE AT IDLE THERE WAS NO THROTTLE RESPONSE THEN THE ENGINE WAS SHUT DOWN BY THE PILOT. A/C RETURNED TO ATL AND LANDED SAFELY. NUMBER ONE ENGINE REPLACED PER TRANS 1T144.