As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 4027 - DURING TAKEOFF, CREW NOTED SPS 1 INOPERATIVE IND FOLLOWED BY AN AOA FAIL CAUTION. CREW ABORTED TAKEOFF. RETURNED TO GATE SAFELY AND IND DID DISAPPEAR AT THIS TIME. NO FURTHER INCIDENTS WERE REPORTED. PERFORMED STALL PROTECTION SYSTEM, OPS CHECK IAW AMM. SYSTEM OK. (M)