Eaton Ultrashift engine will not start in neutral when hot

Hi,

I'm having the above issue and before that it will not drive in second gear, showing a F on the gear indicator screen. If you park the coach up and isolate it for an hour or 2 it will start but once hot will do it again. Here is a video of the service light and warning sound https://youtube.com/shorts/-6Cb7MhhXFQ
This is my first ultrashift and I'm a bit lost,there seems to be limited mechanics in my country who are experts. I'm thinking it must be some sort of sensor but how do I determine which one or do I replace the lot?

 

Australia

 

That's way above my skill set

 

I found someone, oil change and software update, seems to be working heaps better.