As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI BRAKES SEEM INAFFECTIVE ON YELLOW HYDRAULIC SYSTEM. SWITCHED TO GREEN SYSTEM AND BACK TO YELLOW SYSTEM BRAKING NORMAL. MAINTENANCE REMOVED THE ANTI-SKID CONTROL BOX AND CLEANED CONNECTION OPERATIONAL CHECK GOOD. VISUALLY OBSERVED BRAKES ON YELLOW AND GREEN SYSTEM WHEN APPLIED.