What was found
(CAN) DURING CLIMB, THE NR 1 ENGINE REVERTED TO MANUAL AND THE CREW LOST TORQUE INDICATION ON THE LT ENGINE. THE CREW ELECTED TO RETURNED TO THE AIRPORT. UPON TROUBLESHOOTING MAINTENANCE CHECKED THE NR 1 ECU- ENGINE CONTROL UNIT, FOR FAULT CODES. NONE WERE PRESENT. ACFT GROUND RUN, COULD NOT FAULT NR 1 EEC. DUE TO THE PREVIOUS HISTORY OF SIMILAR INTERMITTENT FAULTS AGAINST THIS EEC/ECU AS PRECAUTIONARY MAINTENANCE REPLACED THE EEC/ECU IAW EMM 72-01-10. GROUND RUN AND OPS TRIM CHECKS COMPLETED OK. ACFT- AFH 55892.05, AFC 69478. ENGINE CONTROL UNIT, TSN 36222.11 HRS, 41420 CYC, TSR 2161.34 HRS, 2649 CYC, TSO 36222.11 HRS, 41420 CYC.