As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - CREW REPORTED AFTER TAKEOFF WITH GEAR RETRACTED, FLAPS FIVE, THE AIRCREW FELT A JOLT, HEARD A BOOM AND THE AIRCRAFT VEERED LEFT AND RIGHT. EMERGENCY DECLARED FLIGHT RETURNED LAX LANDED WITHOUT INCINDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND LEFT ENGINE HAD A COMPRESSOR STALL. REPLACED LEFT ENGINE AT LAX ON 07/25/2012. SYSTEM GROUND CHECK NORMAL OPERATION.