Cab 4N - Error

I have a strange problem on a Cab 4N (unit ID is 0001) which basically shows 8001 on the display meters after 5-7 minutes from power on. (No I/O Cards installed)

My main query is, can this '8001' be construed as an error code rather than the normal errors indicated by the usual RX/TX/Link blink codes?

So far I've narrowed it down to the FPGA by eliminating and swapping out the other IC's on the relevant board.  The error is also still apparent if I disconnect the GPIO and CM-2 module expansion boards.

The unit has TX bundles permanently assigned, which can not be reset by SNMP methods from within CNDisco using the Persistence feature.  It would also seem that the bundle assignments are ignored from within NWare too.  My guess is it's flash r/w cycles could have been exhausted with variables still in memory.

Any ideas on the '8001' bit would be gratefully accepted.

Lee