Bosch dishwasher

Hi gentlemen.
Unfortunatley I forgot to get the model number but it’s just out of warranty.
The base is filling with water and activating the anti flood.. After removing the base water, I checked for leaking but found nothing.
I asked customer to use again and let me know……. she rang an hour later saying fault had happened again.
Where is the leak likely to be on this two year old machine?.
I noticed a drain from the front of the dishwasher that terminates in the base but nothing was coming from there when I ran a programme.
Im surprised it’s leaking as it’s relatively new.
Any advice gratefully received.
Chris.