What was found
DURING T/O - 27K BUMP - #1 EGT EXCEEDANCE INDICATION - PER THE QRC/QRH REDUCED THRUST, CLEARED CAUTION PROCEEDED W/NORMAL FLIGHT, #1 INDICATED CONSISTENT 35 DEGREES HIGHER THAN #2 THROUGHOUT FLIGHT. ALL OTHER PARAMETERS MATCHED. GROUNDED - YES. ENGINE #1 BITE TEST ACCOMPLISHED AND GIVEN MSG NBR: 73-31371, UPPER EGT SECTORS READING HIGH. EGT S4 READING 182 DEGR C HIGHER THAN S2 & S3. REMOVED AND REPLACED EGT PROBE T49.5 TOP LEFT (S4) REF B737-800 AMM 77-21-01. NO INDICATION GIVEN FROM T49.5 S4. ACCOMPLISHED GVI OF ENGINE INLET AND EXHAUST, NO DEFECTS NOTED. PERFORMED EXCEEDANCE CHECK REF AMM 71-00-00-740-801-F00. RESET EXCEEDANCE. TEMPERATURE EXCEEDANCE 962.5 FOR DURATION OF 6.6 SECONDS. T/S AND FOUND ELEC CONNECTOR AT DP1001 DIRTY GIVING ERRONEOUS READINGS. CLEANED CONNECTOR DP1001 AND S3 S4 EGT READINGS NML. REF B737-800 WDM 77-21-11-1.