We have a Di551. The Screen Panel has been changed via Key Operators mode, so now none of the screen buttons work. Can get into tech mode, but that is as far as we can go. The screen buttons are way out of wack or off track. We have swapped out two other Di551 panels, hoping alignment w/buttons would return. No Fix. Is there a trouble reset for the panel? Please help. 
Thank you in advance,
Sheila

Thank you in advance,
Sheila
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