What was found
FLT 1803 DURING CRUISE, EN ROUTE FROM PHL TO PIT, THE NR 1 ENGINE EGT INDICATED 1,800. CREW DECLARED AN EMERGENCY AND RETURNED TO FIELD AT PHL. FLIGHT LANDED AND TAXIED TO THE GATE WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND TWO BROKEN SHIELDED WIRE GROUNDS AT CONNECTOR DISCONNECT FOR THE NR 1 ENGINE. REPLACED SHIELDED WIRE PAIRS W3760-220-20W/-219-20R AND W3760-218-20W/-217-20R PER WM 77-31-11 AND SWPM. OPERATIONAL CHECK GOOD.