What was found
DURING ACCOMPLISHMENT OF TC 78273000. NR 1 ENGINE SHOWED FAULT CODE 77-10851, BOTTOM RT EGT SIGNAL OUT OF RANGE T495S2. SHOWED ON RECENT FAULTS LEG 1, 2, 3. FAULT HISTORY ON LEGS 1-9. ACFT GROUNDED. ACCOMPLISHED TROUBLESHOOTING IAW FIM 77-21, TASK 802. FOUND NR 1 ENGINE T49.5 S2 PROBE HAD NO DATA INTO THE EEC. INSPECTED CONNECTORS AT J9, CJ9 AND T49.5S2. FOUND CONNECTOR AT T49.4S2 NOT FULLY ENGAGED. CLEANED CONNECTORS IAW AMM 70-70-01-200-801-F00. CHECKED HARNESSES FOR CONTINUITY FROM DP909 - DP901 & FROM DP911 - DP913. CHECKED NORMAL. PERFORMED T49.5 PROBE & EGT SYSTEM INSPECTION IAW AMM 77-21-01-200-801-F00. CHECKED NORMAL. CHECKED MDCU FOR T49.5 TEMPERATURES. ALL TEMPS WITHIN NORMAL RANGE.