As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT, A/C SLOWED TO A STOP ON THE ACTIVE TAXI WAY ENTERING THE RUNWAY AND WOULD NOT PROGRESS FWD. MX REMOVED ICE FROM THE BRAKES, A/C THEN WAS ABLE TO MOVE AND RETURNED TO GATE WITH NO FURTHER INCIDENT. CLEANED LEFT AND RIGHT BRAKES WITH DEICING FLUID.