As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE LEFT ENG LOST PARTIAL PWR, WOULD NOT ADVANCE BEYOND 67.5 N1 AND 22 FF ON FINAL PWR APPEARED TO RESTORE. ACFT DIVERTED TO ORD AND AN EMERGENCY WAS DECLARED. REMOVED AND REPLACED NR 1 ENG HMU IAW B767 AMM 73-21-14 OPS AND LEAK CHECK GOOD. NO FURTHER DEFECTS NOTED. VERIFIED A/C RELEASED NO ETOPS. ACFT RETURNED TO SERVICE.