Why is my washer leaking from the back?

My washer is leaking from the back. I took off the back access panel and can see water dripping from up above on the left side. I think it only happens during the ending cycles. Is there any possibility of it being a clog/leak with the inlet valve screens? It's not leaking outside the washer, just inside. Unfortunately my dryer is stacked on top of it so I cant easily access the top of the washer. I'm hoping it's an easy fix but I've already tested the cold/warm water lines going in and it's not them. Help!