Brendan Smith is the ultimate knowledge repository for any Gemini issues/repairs in Aus. His contact details can be found at gemini-2.com plus he is active on IIS.
Also, he’s a regular on the Losmandy Users forum
https://groups.io/g/Losmandy_users/topics
It’s worth posting your issue there as they are a very welcoming and informative group, plus Losmandy staff are active on it.