As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORMED TASK CARD 78273000, NR 1 ENGINE HAD LONG TIME FAULT 75-20831 - THE T3 SIGNAL IS OUT OF RANGE. ACFT GROUNDED. IAW FIM 75-33, TASK 802. ACCOMPLISHED INITIAL EVALUATION IAW FIM 75-36, TASK 802, STEP E. FAULT ACTIVE. CLEANED CONNECTORS DP0905 AND DP1005. CHECKED RESISTANCE AT T3 SENSOR CHANNELS A AND B. RESISTANCE WITHIN LIMITS. RESECURED CONNECTORS. REPAIR CONFIRMATION TEST OK.