What was found
#1 EGT WENT TO 911* IN THE YELLOW BAND AT 34000 FEET JUST BEFORE TOP OF DESCENT. ON DESCENT THRU 25000 FEET. THE EGT NORMALISED WITH THE #2 ENGINE AFTER WE REDUCED THE THRUST ON THE #1 ENGINE. THROUGHOUT DESCENT #1 EGT RAN ABOUT 30* TO 100* HOTTER THAN #2 ENGINE. ON SELECTION OF REVERSE THRUST ON LANDING #1 EGT WENT INTO THE RED ARC. GROUNDED - YES. #1 ENG BITE FAULTS ALL 4 T495 PROBES LEG 1. PROBES RESISTANCE OUT OF LIMITS, REPLACED ALL 4 T495 PROBES REF B737-900 AMM 77-21-01/401. ACCOMPLISHED T495 PROBE AND EGT SYSTEM TEST ELECTRICAL RESISTANCE TEST PASSED REF PARAG (1). REPLACED J9 AND J10 HARNESSES REF AMM 73-21-06 EEC BITE CHK GOOD. #1 ENG EGT TEMPS POST HARNESS CHANGE S1 14.87, S2 11.27, S3 11.40, S4 17.20. #1 ENG EXCEEDANCE BOX CLEARED.