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I would begin by looking the schematic to ascertain what triggers this alarm. Might be a limit switch or prox sensor was tweaked out of position with the "sticky" change.
I am not familiar the software in your controller but some will allow you to pull up a diagnostic screen that will show the state of all sensors. Infact if you have such a diagnostic in the SW start there.
I am relatively proficient at reverse engineering old gear, and would go the above route. PM me if want to bounce around some ideas.