As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JUST STARTING THE TAKEOFF ROLL GOT C HYD SYS PRESS CAUTION MESSAGE. ABORTED TAKEOFF AND RAN QRH PVD AMM: 29-11-19-4 REMOVED AND REPLACED CTR HYD SYSTEM PRESSURE SWITCH AT CANNON PLUG S10002. OP'S CHECK GOOD. NO LEAKS OR FAULTS NOTED. AC OK FOR SERVICE. ALL WORK REFERENCED TO AMM 29-11-19-4.