As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4021 DURING CLIMBOUT OF CLT AT 4000FT LOUD POP WAS HEARD, NR 1 ENGINE N1 AND N2 ROWED BACK WITH ITT SPIKE TO AROUND 960. THE CREW THEN PROCEEDED TO SHUTDOWN THE ENGINE WITHIN 1.5 MINUTES. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO CLT. LEFT ENGINE S/N 873946 WAS INSTALLED ON 6/28/2011. NO SIGNIFICANT RECENT HISTORY ON ENGINE. REPLACED LEFT HAND ENGINE. OPS CHECKS GOOD.