Dishwasher leak. I have a General Electric Potscrubber Mobile Maid dishwasher (model GSC720?) that

Question

I have a General Electric Potscrubber Mobile Maid dishwasher (model GSC720?) that hasn't been used in some time, but appears to still work OK. It has a leak from the left hand vent opening in the bottom of the door when operating. The seal around the door appears intact and doesn't leak. Can you suggest a probable cause, and remedy?

Thanks, Bob.