water building up in bottom of freezer- turns to ice. water pan behind cover in back center of freezer doesnt appear to be draining. Where is it supposed to drain to? water has been leaking onto floor. I've turned off water supply to ice maker and water/ice dispenser to see if it is a defrost problem vs. a water line leak. There was ice build up in lower rear back of freezer on left side behind panel- about a four inch square by one inch thick. Parts diagram doesn't show water drain line from the "drain trough which I assume is the black pan with a hole in it in the middle back of the freezer behind the "drain trough cover" in the parts list. I suppose I need to take off the very back panel and see where another water pan is- perhaps the "part ref 260 Water Pan Asm) which you'd think you could reach it from the front! I've defrosted/removed the ice and turned it back on.