Buying a used trainer

[Coureur123]

Hi,

I'm looking to buy my first smart trainer.
Since most trainers are currently out of stock, I searched around for a used trainer.

Via a friend I was informed on someone who was selling his Tacx Flux 2.
Can you give me some advice on what to check on the trainer before a buy one?

The seller has just changed the bearings in the trainer.
This means that this is 'new', but I guess this also indicates that he has been using this trainer pretty often.

Thank you in advance.