As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3576 CREW REPORTED ENGINE 1 POWER FLUX N1 ITT, N2, IGNITION A&B AUTO RELIGHT AND FADEC TRANSFER IN FLIGHT FOR ABOUT 39 SECONDS. THRUST SURGED UP/DOWN CONTINUED FROM ABOVE TRUST LEVERS AT FLT IDLE. ENGINE 1 STABILIZED. NO ABNORMAL INDICATIONS AFTERWARDS. NO EICAS MESSAGES. ACFT REMOVED FROM SERVICE. C/A R&R FPMU AND OPS CHECKED GOOD. FCF PASSED. ACFT RETURNED TO SERVICE.