As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - ABORTED TAKEOFF - FLT 0010 - PILOT REJECTED TAKEOFF AT 60 KTS DUE TO FORWARD CARGO DOOR OPEN INDICATION. MAINTENANCE REMOVED AND REPLACED THE FORWARD CARGO DOOR PROX SWITCH 30WV IAW AMM 52-31-00-05. MAINTENANCE PERFORMED AN OPERATIONAL CHECK OF THE DOOR AND WAS FOUND GOOD.