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Sorry to hear your appliance is having issues, please stand by while I find the answer for you, this is not an immediate service however I will try and respond as soon as possible.As the digital processor has been used the part is second hand, so in reality as there is no fault on the box you will struggle to arrange a return I would have thought.
You could look to buy a complete new kit (pumped version, then use all the parts except the processor to build up the packaging of the wrong kit you purchased), you could then see as you have a complete set if Amazon will deal with a return, and that then just leaves you with the new processor, failing that buy a pumped processor and sell the non-pumped one on ebay.