As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A SURGE - STALL IN CRUISE (STEADY STATE) NR 2 ENG, "AUDIBLE" TO FLT AND CABIN CREW. [07-17-07] ENGINE REPLACED. TEARDOWN SHOWED HEAVY HPC BLADE AIRFOIL DAMAGE FROM THE 6TH STAGE AFT. 1/8TH STAGE BLADE AIRFOIL WAS BROKEN OFF 1/2-INCH ABOVE THE PLATFORM. THE DAMAGE RESULTED FROM THE LIBERATION OF 4 VARIABLE STATOR VANE INNER TRUNNION 'BUTTONS'.