What was found
FLT 1359, JFK-KIN (AIR TURN BACK TO JFK). AFTER TAKE-OFF ENG #2 EGT INDICATION WENT TO AMBER XXX'S WITH AN AMBER ARC. AIR RETURN AT REQUEST OF MOC, GAUGE REMAINED AMBER THROUGHOUT AIR RETURN.; PFR SHOWS WARNING MSG 77-11 ENG 2 SENSOR FAULT WITH CORRELATED FADEC 2A &2B SCHED MAINT REPORT FAULTS SHOWING 77-21-15 EGT SENS/HC/EEC2. TSD PAGES SHOW FAULT ACRONYMS T5L &T5XCF. T/S IAW TSM REF 77-20-0-00-810-802-B.VISUALLY EXAMINED CORE EGT HARNESS, JUNCTION BOX, LH/RH EGT HARNESS & THERMOCOUPLES PER TSM.FOUND MULTIPLE DISCREPANCIES.FOUND CORE EGT TERMINAL ENDS DETERIORATED & BRITTLE WITH RAW WIRE EXPOSED. FOUND IMPROPER INSULATION OF LH/RH EGT HARNESS. MULTIPLE CONN LOOSE WITH DAMAGE TO HARNESS NOTED. FOUND LWR LH THERMOCOUPLE STUDS LOOSE/DAMAGED REF CORRESPONDING LOG PAGES FOR REPLACEMENT OF HARNESS, JUNCTION BOX & 4012KS3 THERMOCOUPLE.R+R OF LOWER LH THERMOCOUPLE 4012KS3 IAW AMM: 77-12-15. REF L/P 3237168-2 FOR ALL OPS, FUNCTION, LK CKS, DUE TO SAME AMM CKS REQUIRED FOR EGT HARNESS CHANGES. R&R #2 ENG LH/RH EGT HARNESS & JUNCTION BOX ASSY REF AMM 77-21-43-400-805-A. REF LP#3237168 ITEMS 1 & 2 FOR CORE EGT HARNESS REPLACEMENT & OPS CHKS. R/R OF NO 2 ENGINE CORE EGT HARNESS REF AMM 77-21-43. REF L/P 3237168 ITEM 2 FOR OPS CK. REF L/P 3237167 ITEMS 1 AND 2, L/P 3237168 ITEMS 1 AND 2 FOR R/R OF EGT HARNESS, EGT CORE HARNESS, THERMOCOUPLE, AND OPS CK. AC OK FOR SVC