TCAS wiring
Some years back I read a WSJ article about an TCAS issued alert over Asia. The alert came late and the planes did not have time to respond fully. Turns out it was a good thing. One of the units had a miswired pin. The wires were reversed and this caused the reverse instructions of the desired one to be issued. Seem to remember the article mentioned Rockwell as the supplier of the offending unit.
Could just be a simple equipment malfunction making itself known at a really bad time.
20driver