Lightning
Along that line, Lazerdog, nobody every gave a good explanation for the TCAS Fail in the ACARS message. Everybody just dismissed it as due to the pitot fails.
Again, a pitot fail will not affect the TCAS. A static fail will cause the transponder to revert to essentially Mode A function only, which will cause the TCAS to shut off, not Fail. Three things come to mind for a TCAS Fail:
Processor Fail
Lower TCAS antenna
Upper TCAS antenna
GB