Triad Sound File
 

I"m looking for a particular sound file for a notification. You might be familiar with it as the 3 note sound played in train stations, etc. to get your attention for an announcement. In musical terms, it is the 3rd inversion of a major triad:

Fifth-Root-Third (5-R-3) but the inversion is sounded in a different order as 5-3-R Music notation attached.

No, I'm not crazy. It does exist. Anyone know where I might find it? Thanks.

https://www.youtube.com/watch?v=q_rPTSzG_xE

Download the video and use audacity to extract the audio and select the segments you want

Excellent! Thanks! The particular one I'm after isn't in that group. Anyway, I decided to make my own using MuseScore midi instruments. For some reason this forum wont let me attach a .ogg or .wav file playing it.