I recently bought an early 843, and there's some kind of small electrical leak that causes the battery to run down, so I have to disconnect the battery if the machine is going to sit for more than a couple of days. I'd like to get to the root of the problem and can gradually work my way through various circuits, but i thought I would ask here whether anyone has solved a similar problem or knows of a common place where a component of insulation may tend to fail. That would let me focus my search more efficiently. Thanks for any advice.