As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TAXIING, CREW REPORTED EXCESSIVE PRESSURE REQUIRED TO OPERATE THE BRAKES WITH THE ANTI-SKID SYS ACTIVATED. DEACTIVATION OF THE ANTI-SKID SYSTEM RESULTED IN NORMAL BRAKING ACTION. MX FOUND THAT THERE WAS EXCESSIVE AIR IN THE LINES. SYS WAS BLED AND NO FURTHER FAILURES WERE REPORTED.