As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BEFORE FLIGHT, DURING TAXI OUT THE CREW GOT A RT BLEED SOV CAS MESSAGE, THEY CONSULTED WITH MX BUT WERE UNABLE TO GET IT TO CLEAR. THE AC RETURNED TO THE GATE. MX CLEANED THE RT LOW PRESSURE AND HIGH PRESSURE VALVE CONNECTORS. WITH NO FURTHER DISCREPANCIES NOTED THE AC WAS RETURNED TO SERVICE. (K)