"Squeals"/"Feedback"/"Harmonic" sound on upper frets on High E only
So a couple months ago I bought an Ibanez RGIR20E-BK (everything original on it, no mods) from a friend of mine and there's this weird problem that doesn't seem to have any answer (Looked on several forums for similar problems but didn't find any solution whatsoever.)
There's this weird squeal/feedback/harmonic/whatever you wanna call it that happens on the 17-24 fret, on the High E string only. I brought it to a shop twice to repair it and they don't have a clue on what it could be.
I swapped the high E and B saddles, didn't work. Went from a .09 to a .11 to a .10, it was slightly weaker with the .11, but it was still there. I would post a Dropbox link here or in the comments but it won't let me, oh well.
Any clues on what this could be? It's an amazing piece of gear, it'd be a shame if there isn't anything to do with it.