As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF, NR 1 LT LEADING EDGE AMBER AND GREEN LIGHT FLICKERED, ALONG WITH INTERMITTENT WARNING HORN. ABORTED TAKEOFF AT 90 KTS. *S/D* THE INDICATION PROBLEM WAS CAUSED BY A LOOSE PIN (PIN 9) IN CONNECTOR DM876B FOR THE M876 PNEUMATIC DRIVE UNIT. THE PIN WAS REPLACED.