As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING T/C 05-020-01 FOUND SHORT-TERM FAULT ENG 1 EEC C1 (TR ANGLE (TRA) SENSOR IS OUT OF RANGE. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM TASK G73-20-00-810-855 NO CORRELATED MSG FOUND, FAULT HISTORY SHOWS NO MSG FOR #1 ENG.