As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PEFORMING T/C 78273000 FOUND #2 ENG SHORT TIME FAULT 73-30902 T12 SIGNALS DISAGREE. GROUNDED - YES. REFERENCE L/P 6049617 FOUND FAULT ON EVERY FLIGHT LEG. REPLACED T12 SENSOR REF B737-800 AMM 73-21-05/401. EEC TEST PASSED WITH NO FAULTS FOUND. ETOPS GROUND VERIFICATION SUCCESSFUL.