D3 TDV6 Manual will not engage low range

Hello to all. We got this D3, its on coils. It's a 1 owner car, and he never put it in low range, and now it will not go into low range.




We removed and inspected the control module in the engine bay for water damage, we didn't spot any and so we put it back in.

Does it happen that the servo part of the transfer box motor, gets damaged due to non use?

Wondering whether to opt for a known working motor, or a new control module, or both

Thanks for reading