D20 H CENTER BOW/H MID PIN don't do jack...

Do H CENTER BOW and H MID PIN in the E BOARD Maintenance Menu do anything for ya'll?

CENTER BOW hardly does anything and only in a rightward manner even at the min setting. MID PIN does nothing perceptible.

Little back story, my monitor came with a D24 ISR and was later modified somehow and at least displays the correct model#, while the serial and hours are reset. Just curious if the ISR could be limiting the potential of the D20 or if this is normal.