As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GE DIAGNOSTICS REPORTS #1 ENGINE TREND DATA SHOWS A DELTA EGT INCREASE AND EGTHDM DECREASE. EGT INDICATION ERRORS ARE SUSPECT. GROUNDED - YES. FOUND J10 HARNESS BAD. REMOVED AND REPLACED J10 HARNESS IAW B737-800 AMM 73-21-06. REMOVED AND REPLACED EGT PROBE S3 BOTTOM LEFT REF AMM 77-21-01. PERFORMED EEC TEST- TEST GOOD. PERFORMED EEC DISCRETES TEST AND IDENT/CONFIG- TEST GOOD REF AMM 73-21-00. ACCOMPLISHED TEST 12 - ACTUATORS TEST, REF AMM 71-00-00-700-807-F00, ALL CHECKS NORMAL, REPAIR CONFIRMATION GOOD.