In the Files Section is an undated document from the manufacturer, "Bright Lights Field Kit Instructions", although its schematic is dated 10/27/86. It carries this advisory: This kit MUST be installed in your Motordome pinball game. Used on the bottom side of the playfield, it's purpose is to protect the "Bright Light" driver transistors from damage. Also In the Files Section is a Service Bulletin dated Nov-14-1986 that likely accompanied that document.