the battery is definatly the first thing i would try.
i dont know the amber board. http://www.zdspb.com/tech/imp/electr...reenamber.html
unfortunatly it doesnt have the light codes there. i dunno where to find the manual for those boards either...you could ask on impulse-owners.com someone there might have an idea.
it does sound like its something in the electronics but not postive.
might check your reg, valve and ram/hammer assembly