As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT COMMENCEMENT OF TAKEOFF ROLL AT 40KTS L EEC MODE STATUS MSG ILLUMINATED. RETURNED TO GATE. ACT- T/S PER FIM. PERFORMED BITE ON L PIMU AND CYCLED EEC SWITCHES. CLEARED MSG AND RAN ENGINES AT IDLE. MSG DID NOT REAPPEAR. ALL INDICATIONS NORMAL.