As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TWO ENGINE SURGES DURING LEVEL OFF. COULD NOT DETERMINE WHICH ENGINE WAS. (AUTO EVENT SHOWS LEFT ENGINE) AC GROUNDED AND BEING WORKED THIS SDR WILL BE AMENDED WHEN COMPIED WITH. WORK DONE IN CVG .REMOVED AND REPLACED RH ENGINE FOR DAMAGE FOUND DURING BORO. DURING ENGINE RUNS LH ENGINE SURGED AND REPLACED LH ENGINE IP CHECK VAVE . OPS CHECK GOOD AFTER ENGINE RUNS .AC RETURNED TO SERVICE "NO ETOPS ".