Leave it be. It’s your bass as it is. “Restoring” it would be like erasing part of your story with it and it just becomes another old Fender.
Right now there is no other bass quite like it on this planet. It’s entirely unique. Why would you sacrifice that to regress to factory-level anonymity?
If anything it should illustrate how a bass cab is coloured to focus on a particular range of frequencies, wheres a PA speaker needs to be able to cover the entire spectrum.
I love the first couple of Primus albums but, after that, the wackyness becomes more and more forced to the point of being unlistenable. Great player, all the same.