Water running down wall None in the tray underneath. Where is the drain that I need to try to unblock? At the back? I pulled out the drawer up near the light because thats where the water seems to come from - running down the inside back wall, but can't see anything; except possibly, maybe a slight crack just above the light? Could that be where water is coming in? Can I unblock a drain (if thats the problem) myself without a service man?