Hotpoint Aquarius DC26S Not Fully Draining - I may need a Schematic?

I have a "Hotpoint Aquarius DC26S" which is not Fully Draining - I may need a Schematic as I have been told to clean both filters inside the machine, clean and clear any blockages which may stop an impeller inside the machine next to the filters, I have been advised to use the x2 buttons to reset the machine which I have done and the last option available would be to check a secondary impeller under the machine. I have stripped the dishwasher down to it;s bare essentials and the only part I can not remove is a Black Hard Plastic Container which all the electrics and Pump and motor etc fits in under the machine. I believe this is where the secondary impeller is situated and without a Schematic Diagram, I am not able to proceed any further. I was told if I can get to the secondary impeller, then it maybe a simple blockage which maybe causing the issue. I have ran the dishwasher on a low cold setting and also on a 70c (Hottest setting) and even though there is very hot water being used and the water seems to drain, I am left with water still in the base of the dishwasher.

If I could be provided with a Schematic Diagram of the dishwasher, I am sure I could fix the problem, however if it requires a new part, the website which brought me to this website, has all the parts I require.

Any and all help and advice, would be greatly appreciated as I have been making myself unwell with stress at trying to fix this thing.