just a thought most keyfobs when you press the button you get a steady light , you say yours are flashing could the remote batteries beflat , do you have any wireless sensors on the system and iff so do they still send signals.
One I came across recently all the wireless sensors stopped working hardwired still worked ask customer had he done anything to panel he said no eventually went into roof client had replaced panel battery recently and the radio receiver was screwed to lid when he open the lid the connector from the wireless receiver to plug on board yanked out killing all the wireless he didnt noticed replaced panel battery and closed lid
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