Water pooling under fridge

Good afternoon I wonder if anyone has any suggestions please, my Liebherr fridge freezer has started to leak water underneath and I’m blowed if I can find from where.
I have checked that the drain pipe is free running by getting the other half to squirt water down it with a baster while I’m round the back watching and it drains into the thing it is supposed to ok and that does not appear to be leaking at all.

The model is CUN 3513 index 21f/001

service number 9990014-06

serial no 26.830.226.7

Everything seems to be ok and working correctly apart from the water leaking which amounts to approx half a cup over a couple of days.

Temperatures are all ok as well I should add.

Here’s hoping David