As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 EGT FLUCTUATED RAPIDLY AND THEN DROPPED TO ZERO DURING TAKEOFF ROLL. TAKEOFF ABORTED AT APPROX 40 KNOTS. ACFT RETURNED TO BLOCKS. INSPECTED THERMOCOUPLE HARNESS JUNCTIONS. NO DEFECTS NOTED. REMOVED, CLEANED AND INSPECTED EGT HARNESS PYLON CONNECTOR. INDICATION OPS CHECKED GOOD ON ENGINE RUN IAW ENGINE RUN HANDBOOK 70.01 AND MM 77-28-0. COMPLIED WITH GMM 3.124. ENGINE RUN PERFORMED BY CREW.