What was found
(CAN) DURING TAXI, IT WAS OBSERVED THAT THE NR 1 ENGINE EPR HAD NO INDICATION. THE AIRCRAFT WAS RETURNED TO THE RAMP. AFTER SOME TROUBLESHOOTING, MEL 77-01-01 WAS RAISED. THIS IS A 3 FLIGHT DAY, A CAT, MEL. THE AIRCRAFT WAS DISPATCHED.ON RETURN TO HOME BASE, THE EPR TRANSMITTER WAS REPLACED AND CHECKED SERVICEABLE AND NO FURTHER PROBLEM DURING SUBSEQUENT FLIGHT.