As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT AFTER ENGINE START AND ON TAXI A "BLUE" SINGLE RUDDER CAS WILL COME ON INTERMITTENTLY THEN GO OUT AND REMAIN OUT AFTER A COUPLE OF SECONDS. THE MAINTENANCE TEAM TROUBLESHOT AND REPLACED THE LEFT HYDRAULIC MANIFOLD FILTER, ENGINE BYPASS FILTER, PTU CASE DRAIN FILTER AND AUX RETURN FILTER. THE LEFT AND RIGHT HYDRAULIC SYSTEMS WERE BLED AND LEAK CHECKED, NO DISCREPANCIES WERE NOTED. AIRCRAFT WAS RETURNED TO SERVICE.