As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TCAS FAIL ON GROUND. FLIGHT CANCELLED. CORRECTIVE ACTION: FAULT ISOLATION PERFORMED TH THE TCAS TOP ANTENNA IAW FIM 34-45 TASK 803 AND HAS BEEN FOUND CORROSION IN CONNECTOR. PERFORMED CLEANING OF CONNECTOR IAW 34-45 TASK 805 ITEM F (3)(B) OPERATIONAL TEST SATISFACTORY