As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BTB - GROUND TURNBACK PRIOR TO TAKEOFF L GEN CONTROL L BUSS TIE ISOLATED AFTER RE-ESTABLISHING BUSS PER CHECKLIST FWD EZ SUPPLY FAN 1 AND T/R UNIT STATUS LIGHTS REMAIN ILLUMINATED. PERFORMED FIM 24-33-00 RESET AS NEEDED GROUND RUN CHECK GOOD.