As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIOR TO DEPARTURE, NOTICED FLUID COMING OUT OF HYD RESERVOIR DRAIN. UPON TROUBLESHOOTING, IT WAS FOUND THAT THE SHUTTLE VLV NR 4 BRAKE ASSEMBLY FAILED & TRANSFERRING FLUID FROM NR 2 TO NR 1 HYD SYS. REPLACED NR 4 BRAKE SHUTTLE VLV WITH SERVICEABLE ONE & RETURNED THE ACFT TO SERVICE.