Changing gain on an old Tom Evans Design Microgroove

I’m new here and joined due to a specific problem I am facing. I have an old out of warranty Tom Evans Design Microgroove.

It has too much (factory set) gain for the Rega Ania cartridge (0.35mV) that I intend to use with it.

Please see pictures of the unit inside. As I live in Denmark (EU) it will be very expensive and impractical to ship it to the factory for modification. Can any of you provide some brief instructions and/or a schematic of how to change the gain and any components needed? I completely understand that any changes carried out on the unit are done at my discretion and solely my risk.

Any input would be highly appreciated!
 

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