What was found
ENGINE #1 ENGINE CONTROL LIGHT ON. GROUNDED - YES. CONSULTED WITH TECH SERVICES ENG #1 FAULT CODE 73-30811 REQUIRES T12 SENSOR REINSTALLATION REPLACEMENT. AS A PRECAUTION PERFORMED B737-800 FIM 73-26 TASK 804: DISCONNECTED, CLEANED, AND RECONNECTED EEC J7 & J8 CONNECTOR. NO OTHER DEFECTS FOUND AT THIS TIME. RAN #1 ENGINE FOR 5 MINUTES, PERFORMED EEC BITE #1 ENGINE TEST SHOWED FAULT 73-20811. REMOVED AND REPLACED #1 ENGINE T12 SENSOR IAW B737-800 AMM 73-21-05. RAN #1 ENGINE FOR 5 MINUTES, PERFORMED EEC BITE #1 ENGINE IAW AMM 73-21-00. NO FAULTS. AIRCRAFT GOOD FOR SERVICE. GROUND VERIFICATION SUCESSFUL.