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, SHORT TIME FAULT 73-30901 "T12 SIGNALS DISAGREE" WAS FOUND FOR FLT LEGS 1, 2, & 3 ON ENG #1. GROUNDED - YES. EEC BITE PER T/C 78273000 SHOWED FAULT HAS NOT LOGGED IN LAST EIGHT STARTS, SINCE REPLACEMENT OF T12 SENSOR ON DEFECT 60206442. PERFORMED EEC TEST PER B737-800 AMM 73-21-00-700-804-F00 - ALL TESTS PASS.