What was found
DURING CLIMB OUT, CREW REPORTED INITIALLY, LOSS OF BOTH EPR INDICATIONS & NO SPEED INDICATION, DECIDED TO RETURN. DID NOT DECLARE AN EMER & RETURNED, LANDED WITHOUT FURTHER INCIDENT. UPON ARRIVAL, THE LOGBOOK DISCREPANCY WAS SPD INDICATION ON THE ADI & LOSS OF TARGET EPR ON BOTH ENGS. AT THE GATE, MECHANICS HAD THE CREW RUN BOTH ENGS AT IDLE TO VERIFY THE EPR WAS WORKING, BOTH ON EICAS & SEI, JUST THE TARGETS WERE GONE. MX COORDINATED WITH MOC & MEL 77-00-01, CNTL 767-15-0079 ISSUED FOR THE EPR TARGETS & MEL 34-13-10, CNTL 767-15-0080 ISSUED FOR THE SPD INDICATION ON THE EADI. ACFT WAS RELEASED TO CONTINUE OPERATION WITH A 295 MIN DELAY. THE TMC FAILED ON TAKEOFF, CAUSING THE EPR TARGETS TO FAIL, TRIPPED OFF THE AUTO THROTTLE & CAUSED THE SPEED FLAGS ON THE ADI. THRUST MANAGEMENT COMPUTER WAS PLACED ON ORDER.