A few days ago, I picked up a used SBMM Ray34. I wanted to play the instrument beforehand, but the area where we made the exchange had no socket to plug an amp into. Gave it a quick once over and decided the guy seemed nice enough, so I bought it. Fast forward a couple of days and now I'm getting a noticeable low rumble on the E string whenever I turn the onboard bass eq past flat and play even slightly hard, and rattling and buzzing from both the low frets and bridge. Aside from very slight bridge rattling on the A string, the E string is the only one with any issues. I am inexperienced in bass repair, so I am not sure how to fix this. Any help would be appreciated.