After using two GTI seascooters successfully for 2 seasons of snorkling and shallow dives in the keys.one has failed due to abuse (sand in o-rings after lending it out).Had water in battery chamber. unit is out of warnt. so I am trying to remove battery tray to get to circuit board. Black battery tray will not pull out after removing 3 screws at bottom. Can anyone help who has done this???? Thanks