1. right click
on desktop →
choose Personalize → Sounds
2. A window will pop-up with Sound settings similar to one below:
3. Under Program Events
section you will find a list of possible actions that can trigger sounds in Windows. The one with Speaker next to them have actually some sounds attached to them. You can test how it sounds by clicking Test
button. Try testing every sound with speaker next to it and see/hear if any of those sounds sound familiar.
4. Report your findings