What was found
(CAN) NR2 BRAKE DEBOOSTER VALVE SPLIT AT LOWER END. OCCURRED AFTER AIRCRAFT PUSH BACK AND STARTED TO TAXI. RETURNED TO GATE. REPLACED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
(CAN) NR2 BRAKE DEBOOSTER VALVE SPLIT AT LOWER END. OCCURRED AFTER AIRCRAFT PUSH BACK AND STARTED TO TAXI. RETURNED TO GATE. REPLACED.