Grinding noise, I think when focussing

I have a Panasonic Lumix DMC-TS2.

It started (a while ago, it has been sitting unused since) making a grinding noise, as you can hear in this video: https://www.youtube.com/watch?v=ij9FwyNL...

It's pretty loud, and much louder in videos recorded on the camera itself.

Turning Optical Image Stabilisation off has no effect, so it would seem the noise is on focussing, rather than IS.

It's had very little use, and I don't think it ever went under water. It may have even been under warranty when this problem started, but I didn't do anything about it.

I'd like to start using the camera again. Any tips? I'm happy to open it up and poke around. Hopefully it's just a gear that isn't sitting properly. If it doesn't go back together again, no big deal.

Thanks.