All buzzes are fixable. The hard part is finding the cause. Having experience in this, I have a suspician, the copper winding is buzzing on the core of the string. Pretty common in the lower register. The string has to be loosened a bit until the loop end can be lifted from the bridge pin. Take a thin screw driver or hold the end with a vise grip and turn the string clockwise one whole turn. You will feel the pressure. Hold the pressure and return the loop onto the bridge pin. This tightens the copper wrap onto the core and stops the buzzing.Hope this helps you out.