To add to DaveK I believe when you get a message on the screen there is the option to "hide" the message. If you select "hide", then the next message if any will appear on the screen. We had a M4555 that had a scanner 30 error and when I selected the "hide" button the 58.04 error appeared which indicated a fail of the lvps on that unit and what was causing the scanner error in the first place.
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