Is this what you mean?
Here’s the service manual that may also help as it has all the part numbers so you may be able to find other suppliers by searching for the part number.
Hi @Gunnar Carlman
Strange that there are two different models with the same model number.
Has your model got any other information on the product information label that is usually attached to the device which could identify it further as here's the Akai 4000DS Mark II service manual
If this looks more like your model it also has a parts list.
Find the wanted part in the parts list and search online using the number "only" or if no good search for "Akai (insert wanted part number)".
It's getting late here so I didn't have time to look through it ;-)