As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENG HAD A MODERATE TO LARGE COMPRESSOR STALL-BOOM AT STEADY STATE POWER SETTING OF 1.30 EPR. WIND 290-1 4 KTS. EICAS STATUS MSG GENERATED -R SURGE DET- MSG. NR 2 ENGINE SURGED REPEATEDLY ON GROUND RUNS. HPC BORESCOPE NOTED NO DEFECTS. ENGINE REPLACED AT SFO PRIOR TO FURTHER FLIGHT. SHOP TROUBLESHOOTING DID NOT DISCLOSE ANY CONCLUSIVE FINDINGS. ENGINE CONVERTED TO RING CASE CONFIGURATION (RCC) IAW AD 2003-19-15.