As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING T/C 78273000 FOUND A LONG TERM FAULT ON THE #1 ENG, FAULT # 75-20831 "THE T3 SIGNAL IS OUT OF RANGE". GROUNDED - YES. ACCOMPLISHED EEC BITE FOUND CODE TO BE INTERMITTENT. INSPECTED CONNECTOR AND DISCONNECTED & RECONNECTED THREE TIMES PER B737-900 FIM 75-33 TASK 802. NO DEFECTS NOTED.