I agree with the EvilCapitolist. Sound like you need to open her up and vacuum it clean but take is slow and gentle. You do not want to hit anything too hard and break it.

The SE is the better machine for caps, their logic boards rarely need recapping. But the Analog Board is another matter, its the classic Mac weakest link. Since your video seems rock solid, it probably wont need a recapping there either, not for a while. But I would advise to get the recapping parts for it and soon, this way when it fails, you are ready to fix it.

Great to see a Mac rescued from the killer of all Macs - the Garbage Dump! Hope it will serve you well.