User blog:LunchTime123/Identifying A Sound Effect?

Hiya! I was wondering if you sound geniuses could help me. I like making YouTube videos myself, and there's one sound effect I'm after, but I don't know the name of. Among several other things, it can be heard at 4:52 on this Sooty episode:

https://www.youtube.com/watch?v=BxhQjCvj278

It's a sort of power down sound, but I don't know the name of it, or what sound library it's in. Any ideas?