What was found
DURING CLIMB-OUT ABOVE 14,000, THE CREW NOTICED AN ABNORMAL SPLIT IN ENGINE PARAMETERS WITH THRUST LEVERS MATCHED UP. WHEN TRYING TO MATCH EPR, THERE WAS A HUGE SPLIT IN THRUST LEVER POSITION AND N1, N2, N3, EGT AND FUEL FLOW. AIRCRAFT RETURNED TO ORD AND LANDED WITHOUT INCIDENT. REMOVED AND REPLACED NR 1 EPR TRANSMITTER. OPERATIONAL CHECK NORMAL.