Is not evacuating all water?

Hi, I have a French Proline dishwasher which has decided not to evacuate all of the water. Having just noticed this,I do not want to put my size 11 boot in it. Can anybody advise me as to how to solve this problem. I have emptied all of the water and cannot see how I can get to the drain plug to check for blockage. I presume its under all of the plastic at the bottom which has what looks like the water inlet as well.
Help please