What do you mean by "modified FAS" ?
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-> help undefined symbol: help
To be clear, I meant the serial "service console" connection only accessible inside the unit's case, not the regular RS232 interface on the back panel.
Check for DIP switches at the back of the unit (those that would set the GPIB address), sometimes one of them can set modes like this. Otherwise you might have a more serious problem like the CPU not booting properly.