As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MSP - FLT 434 - ON TAKEOFF ROLL, THE LEFT OIL PRESSURE WARNING LIGHT ILLLUMINATED. THE CREW ABORTED THE TAKEOFF AND RETURNED TO THE HANGAR. MAINTENANCE INSPECTED THE SWITCH ASSY AND FOUND WATER IN THE CANNON PLUG. THE PLUG WAS DRIED OUT AND THE SYSTEM OPERATED NORMALLY. THE AIRCRAFT WAS RETURNED TO SERVICE. (X)