As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/A ATB- XPNDR 1 IN TA/RA SHOWED TCAS OFF, SWITCHED TO XPNDR 2 IN TA/RA SHOWED TCAS OFF. ATC COULD NOT SEE US. CYCLED BACK AND FORTH SEVERAL TIMES IT DID NOT WORK.NO FAULT FOUND. OPS TEST PER AMM 34-45-00-715-001-004 TEST OK . R/R TCAS COMPUTER PER AMM 34-45-01. OPS TEST OK. EFF SOURCE REF: IPC 34-45-01-02B-020K.