ms alarm on kitamura mycenter3 with yasnac I80m control

[bluechip9]

Can anyone help? We have a 1996 Kitamura Mycenter 3 with a Yasnak I80m control. Sometimes it starts up and works fine and sometimes it will fire up but wont make a tool change.
Or, if it makes a tool change, the spindle will not start. We get MS on the screen for an alarm. Nothing else. Does anyone know what that could be?
Thank you

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[ncbobbys]

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