As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TASK CARD 78273000 FMC BITE CHECK FOUND ENG 1 FAULT CODE 75-10831. THE T3 SIGNAL IS OUT OF RANGE. LONG TIME FAULT. DEFERRED PER TC 78273000. GROUNDED - YES. ACCOMPLISHED T/C 78273000 FMC CDU ENGINES, ENG NR 1 FAULT CODE 75-10831 NO LONGER EXISTS THIS CLEARS PLT.