As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 7775, FLG - PHX DISCREPANCY: RIGHT BRAKE FAILED ON TAXI TO RUNWAY. AIRCRAFT WAS TOWED BACK TO THE RAMP. CORRECTIVE ACTION: FOUND RIGHT BRAKE LINE BROKEN. REPLACED BOTH LEFT AND RIGHT BRAKE LINES WITH NEW. BLED BRAKE SYSTEM. OPS CHECK GOOD.