It is important that you are able to identify the problems that you are able to deal with without the help of an expert. Some of the things that you can do would be:
Screw Loose: Most of bass guitars’ parts are connected and held together by glue and screws. If there are parts of the bass guitar with a screw lose, you can use a Phillips head to screw them back. However, if the parts that are affected or loosening up have glue then it is better to bring it to a professional since there are different glues used depending on the kind of wood which needs to be glued together.
Finish: If you are not willing to spend money and have a professional examine your bass guitar’s finish and is confident in repairing minor cracks on it then you can utilize a small bottle of toy paint to seal the cracks and hide them. Rubbing the entire length of the neck up and down by using an OOOO-grade, superfine, steel wool can help make the back of the bass guitar become smoother if not perfect.
Electronics: Electrical problems in a bass guitar are usually complex and if there is only one thing that you can troubleshoot that is electrical in origin, it is when you hear a crackling sound when you turn the knobs on the bass guitar. Make it a point to apply force when you turn them back and forth and if it still does not seem to work then you have to get in touch with a professional.
You can only do much on your gretsch bass guitars at guitar center and if nothing works, you have no other choice but to get in touch with a professional.