Question about De'Longhi Ec820.B Pump Espresso Coffee Machine, Black

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How to fix a coffee machine

We have had this coffee machine for 2,5 years now and after last descaling it stopped working properly.I think it lost its pressure as it seems to be blocked - the coffee goes very slowly at the beginning and then it does not create a creme, the coffee is disgusting. We have been told that it could be a pump and the boiler - common issue in this model. Can we repair it ourselves? As service is not worth it (we have been told). IF so, how to do it and where to order parts?

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