Exchange broken potentiometer of a dimmable halogen lamp

[T_guttata]

Dear all,

I have a special lamp (medical equipment) from 1994 with a broken potentiometer. I need to find a sparepart for that, but since I'm not very familiar with the circuitry I hoped someone could help me.
The halogen lamp uses an electronic transformer with 22.8V AC output, but I could not find any schematic. Therefore, I don't know exactly what the potentiometer does and how I can find a spare part.

I have made a few pictures. Based on those pictures, can anyone point me in the right direction?

Thanks!

[inse]

Look carefully if the resistance value is noted somewhere on the potentiometer or try to measure the maximum resistance.
Then you need to find a model with enclosed switch suitable for 230V.
If you don’t succeed, the only chance would be to have a separate switch and potentiometer.