As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORMED TASK CARD 78273000, #1 ENGINE HAD LONG TIME FAULT 75-20831 - "THE T3 SIGNAL IS OUT OF RANGE". GROUNDED - YES. PERFORMED EEC BITE PROCEDURE IAW B737-900 FIM 75-33 TASK 802, STEP 802 E(1), NO FAULTS NOTED FOR RECENT FAULTS OR FLIGHT HISTORY. PERFORMED EEC TEST IAW B737-900 FIM 75-33 TASK 802 STEP E (2) (A). NO FAULTS NOTED, ALL TESTS ON #1 ENGINE.