As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RTO AT 50K DUE TO -L DEM OVHT- EICAS MESSAGE. RETURNED TO GATE. T/S SYSTEM INSPECTED WIRING IN LEFT PYLON. LOOKS OK. PERFORMED ENG RUN, ALL HYD SYSTEMS OPERATE NORMALLY. AS PRECAUTIONARY REPLACED L DEMAND PUMP CONN D916 AND CASE DRAIN AND PRESS FILTERS. LEAK CHECK AND OPS CHECK GOOD.