As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 BLEED VALVE FAILED ON TAKEOFF ROLL. ABORTED THE TAKEOFF. INSPECTED THE NR 1 ENGINE BLEED VALVE AND FOUND THE LOCK SCREW TO BE LOOSE. TIGHTENED THE LOCK SCREW. PERFORMED AN ENGINE BLEED VALVE FUNCTIONAL OPS CHECK IAW AMM 36-11-05. CHECKED GOOD. OK FOR SERVICE.