Kashering a Used Magimix for Passover and Year-Round Use

A little over a year ago, I received a Magimix from a family that might use non-stringent kashrut certifications. According to them, they used it only for vegetables and do not recall using it with heat. Onions were likely used, and likely the onions were cut with a chametz knife. I asked them if it might have sat dirty for a long time or with other dirty utensils, and they could not answer. The question is whether there is an issue with kashering it for Passover, or at least for the rest of the year, and whether the fact that the appliance has been unused for a year matters.

Hello,

It is not ideal to kasher it for Passover. 

The fact that a year has passed does not help. 

According to the instructions of the Gaon, Rabbi Amram Fried, shlita

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