CAR42ZE - There aren't any messages in the maintenance page relating to this fault
TOTTIGOL - When we did the test in our older, short nose machines, we had to have the XPDR on for the test...that's not the case with our current aircraft...normally tests fine with the XPDR in SBY
Believe it or not, about 30 min into a flight last night, the bloody thing came good. Subsequent tests on ground produced the correct results...go figure.