What was found
NR 1 ENGINE EGT SHOWED HIGH TEMPERATURE EXCEEDANCE. ON TAKEOFF, APPROXIMATELY 1000 DEGREES FOR A FEW SECONDS. AUTO THROTTLES WERE ON ENGINE OPERATED NORMALLY AFTER THAT EVENT. AT CRUISE NR 1 ENGINE TEMPERATURE SHOWED 30 DEGREES HIGHER THAN NR 2 ENGINE. ACFT GROUNDED. PERFORMED ENGINE EXCEEDANCE BITE ON ENGINE NR 1, FOUND EGT RED FOR 27 SECONDS AT 969 DEGREES C. NR 1 ENG SHOWS ECONOMIC FAULT MESSAGE 77-20861, THE BOTTOM LT EGT SIGNAL IS OUT OF RANGE. PERFORMED ENGINE INLET & EXHAUST INSPECTION REF AMM 77-00-00, NO DEFECTS FOUND. WHILE PERFORMING EGT SYSTEM INSPECTION, FOUND SOCKET TENSION LOW ON SOCKET 2 ON CONNECTOR DP1001 REF 77-21-01200-801-F00. REPLACED J10 HARNESS, REF MM 73-21-06. ACCOMPLISHED ALL FADEC SYS TEST REF MM 73-21-00-700-802-F00. PERFORMED POWER ASSURANCE CHECK REF AMM 71-00-00-700-813-F00. CHECK PASSES REF AMM 71-00-00-700-813-F00, PG 10, FIG 503.