3520.53 movement help

All,

I purchased a 3520.53 recently and it was said to have been serviced Jan 2024. Previous owner said that start/stop pusher was replaced during service.

After all day at work, amplitude is around 225-240 with the rate being -12/+3 with up to 0.5 beat error.
After a 30-45 minute walk it was more wound and has amplitude of up to 282, with rate no more -6 and the beat error 0-0.2.

Chrono on/off is about 18* amplitude difference with sometimes only 0-6* difference.

Just wondering if I should be concerned about the movement health and get it serviced again while it still may have a warranty on the service. Don’t want to take the caseback off since it’s a snap one and I don’t have the tools to correctly press it back on.

Thanks,
Deacon

No proof, seller just said it was serviced by omega Jan of 24. He didn’t provide any documentation of that

That’s fair haha.
It seems to run okay other than not winding well. Lift angle is set to 50.
I’ll look into getting it sent off
Thank you