Siemens SE63630 dishwasher disassembly for pump cleaning, advice pls

We have this dishwasher, and all filters and sprayarms are clean. I ran the machine without the spray arms, and the fontain from the hole won't even hit the top ceiling of the dishwasher. The pump is working, and it sounds smooth enough, however, I suspect that food remnants are clogging the pump and therefore too little pressure is generated.
I have not been able to find any manual or even a diagram to show me where to start. Any ideas? When I remove all filters (flat filter and basket type filter screwed into it) there's a plastic bucket under the stainless steel plating, held upwards against a rubber seal using two screws. I had hoped that some bright engineer would make these pump blades easliy accessible, but I'm out of luck. BTW the Siemens seems to be similar to Bosch models, because my inlaws have one exactly like this one but branded Bosch.
Any help appreciated!

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