On the inside of the cabinet on the right hand side is a plastic retainer a couple of inches in diameter.
This is probably loose causing the leak.
It may need replacing or just tightening.
The opening your refeing to is the air break, if you have water coming out this then you probably need an expert to look at it, honestly you probably looking at a Miele Engineer, unless you've got someone local who is very good i would steer clear of local press, word of mouth is best. But you may find that the investment in the Miele call would be worth while because it may take a few visits to track it down, in which case you only pay once someone local may charge you each time.
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