Hi. I just had my bass at a shop for complete setup cus I was having some issues with fret buzz. They did a solid job and it was sounding and playing great when I got it back. The bass is tuned in D standard and was set up accordingly. The problem started again when my brother was visiting and borrowed my bass and tuned it up to E standard since that's what he was comfortable with. I tuned it back to D standard pretty quick after and now I got some nasty feet buzz again on the lowest string (9ish+ frets) . Is this most likely unwanted bow in the neck due to added tension in the strings, cus it got tuned back and forth to quick? What is the best course of action to remedy this without having it sent back to the shop?