As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TCAS INOP, TCAS INOPERATIVE. TCAS FAIL BOTH TRANSPONDER COMPUTER, T/S IAW FIM 34-45 FAULT TREE 802. PERFORMED TCAS BITE PROCEDURE AND COULD NOT DUPLICATE FAULT. REMOVED AND REPLACED TCAS COMPUTER AS A PRECAUTION IAW AMM 34-45-01. OPS CHECK GOOD. NO FAULTS NOTED AT THIS TIME.