How do I find out where the water is coming from that is accumulating under the crispers. Is there a line stopped up somewhere?

Usually the water runs down the back of the inside of the unit. Some times there is a drain under the crispers but many times there is not. That means that the drain line in the compartment above is plugged up or frozen. The drain line extends from the bottom for the freezer compartment to the catch pan under the refrigetator and the clog could be anywhere in between. If you have access to a compressed air tool you can blow the drain clear. If not try a bit of hot water down the drain hole.