See a couple of these machines where the air vent has worked loose & caused leaks. Look inside the machine on the right hand side, about 3-4" up from the base there is a round plastic air vent that connects to the water jacket on the outside of the machine. Try to give it a nip clockwise to make sure it is tight (but don't over-tighten it). You may have to use a pair of long nosed pliers or similar to get some leverage to turn it. Then run the machine on the hottest program & recheck for leaks. It may be an advantage to remove the right hand panel just to observe there is no leakage from the water jacket itself.