The door on our 12 yr old 601 freezer has become noticeably more difficult to open over the last 3 months or so. You can still open it, you just have to give it a good jerk to do so. I wedged a napkin between the gasket and the door frame to ease the vacuum inside, and it then opened a lot easier - more like it used to a couple of months ago. Based on this, I think the drain line has iced up. But I have no idea where it is, or how to get to it, hence the manual request. So, can someone point me towards a manual for this freezer? Thanks, Guy