As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO TAXI WHEN POWER UP TO 80% N2. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. PARKING BRAKE CYCLE SEVERAL TIMES ALL BRAKES MOVED AND CHECKED. PARKING BRAKE VALVE OK, BITE TEST ON ANTISKID MODULE AND NO DISCREPANCIES NOTED IAW AMM 32-44-00. AIRCRAFT RETURNED TO SERVICE