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Wandel Goltermann NFA-1, CPU2B/2 board ROM defect, copy of firmware wanted, please help!!

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gunter picture

Hi All,
after a longer period I started the system, but the it stops booting and the screen stayed dark. I found the problem in the display-CPU (named CPU2B/2). One of three EPROMs has absolutely no access also not with my reader. Could somebody please help me with a copy of the firmware (V61 or similar)?  Many thanks for your time
Cheers Gunter