What was found
DURING PREFLIGHT CHECKLIST RUDDER BOOST WOULD NOT TEST. CREW RETURNED TO BLOCK. DETERMINED PROBLEM DUE TO DAU NOT RECEIVING THRUST REVERSER STOWED SIGNAL. FOUND THRUST REVERSER CONTROL BOX FAILED. REPLACED THRUST REVERSER CONTROL BOX.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING PREFLIGHT CHECKLIST RUDDER BOOST WOULD NOT TEST. CREW RETURNED TO BLOCK. DETERMINED PROBLEM DUE TO DAU NOT RECEIVING THRUST REVERSER STOWED SIGNAL. FOUND THRUST REVERSER CONTROL BOX FAILED. REPLACED THRUST REVERSER CONTROL BOX.