As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT EMERGENCY DECLARATION. AIR TURN BACK. 5 COMPRESSOR STALLS/SURGES WITH ENGINE EXCEEDANCE VALUES RECORDED. INDICATIONS RETURNED TO NORMAL THEREAFTER AND PRIOR TO LANDING. AIRCRAFT GROUNDED FOR BORESCOPE INSPECTION AND FURTHER ANALYSIS. WORK IN PROGRESS. REMOVED AND REPLACED VALVE ASSY. REMOVED AND REPLACED RIGHT ENGINE. OPERATIONAL CHECKS SATISFACTORY. ENGINE RUNS SATISFACTORY. FAULT NOT DUPLICATED. NO FURTHER DEFECTS NOTED. AIRCRAFT RELEASED TO SERVICE ETOPS 180.