Help reviving SB3 needed

I obtained a used SB3, that will play one track and start a second but then stops playing. Restarting LMS from the terminal will get it working or pulling the power plug and reinserting but it will only play one or at most 2 tracks before quitting.I am using the Toslink connection but tried the analogue and only had one channel working.

What I have tried
Factory reset
XLinx reset
Different working power supply
Cleaning and reseating the WiFi card

I don't have any skill with a soldering iron.

Any suggestions would be welcome.