You can try the following:
Resetting the system by: Shift > 1 > Enter or * > 1 > # (Depending on your keypad model)
Now try * > 5 > #
If the above does not work I suggest taking to the C&K with a sledge hammer and then looking around for quotes for a more up to date system.
I know a few techs that do C&K / MCM / Verex System removals free of charge using nothing more then a sledge hammer, mind you they do make a hell of a mess
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