The volume pot on one of my telecasters is a little wonky. When turned all the way up, at the end of it's travel the volume is closer to what it would be at say 50%. If I roll back the volume, just a touch it goes back to full volume. Any idea what might be causing this. What would be the best method to trouble shoot this? The harness is a Mojotone solderless with a 4 way switch.