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eurotherm 3504 program change

Hi, we have a euortherm 3504 controlling an oven. There is a normally open contact/button connected to i/p LA and LC which previously scrolled the program numbers upwards when pressed instead of using the keys on the controller. For some reason it no longer works, I have checked the button which still works so could some parameter have been changed, I have looked through the configuration but do not know enough about these to ascertain which parameter it may be. Any suggestions would be welcome.
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