What was found
SHIP 9521 - THE FLIGHT CREW RETURNED THE AIRCRAFT BACK TO ATL AND LANDED WITHOUT FURTHER INCIDENT AFTER THE #2 ENGINE EXPERIENCED A COMPRESSOR STALL DURING CLIMB OUT. AT FL230, A LOUD REPORT WAS HEARD, FOLLOWED BY STRONG VIBRATIONS (9.9 UNITS) FROM THE ENGINE, THEN THE OIL PRESSURE DROPPED BELOW RED-LINE, AND THE CREW SHUT DOWN THE #2 ENGINE. THE CABIN CREW REPORTED THAT THERE WAS SMOKE ACCUMULATING IN THE CABIN DURING THIS ENGINE FAILURE EVENT. CORRECTIVE ACTION: MAINTENANCE FOUND METAL IN THE #2 ENGINE TAIL PIPE AND REPLACED THE ENGINE. (LP #8831952)