Skylights are Midi-Heki (German) but distributed by Dometic here. Probably go to them for parts.
Thor went to the manual skylight in 2016 because of problems with motorized. Don't know if you can convert. (FWIW my manual unit has been trouble free.)
Here is the skylight manual, the troubleshooting is not extensive.
https://cdn.shopify.com/s/files/1/12...42012250062050
Parts breakdown by model here:
https://www.leisurespares.co.uk/bran...-style-700x500
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