strange 2001N fault

Hi all,
in case someone doesn't read vcfed forums, my 3032 developed a strange fault:

http://www.vcfed.org/forum/showthread.php?62202-3032-(2001N)-strange-fault

The thread link is just to recap what I've found and what I did, so I
don't have to type all again here ;-)
Ideas welcome, I'm just scratching my head. This is probably where a
logic analyzer is needed badly.
It seems to me there're unintended writes on some ram locations (not
so random, address wise) and it makes me think about VSP crashes on
C64.
Any idea where to look for a fault?
Frank

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