Classic Sabre Very Low Volume

My classic Sabre bass has a very low output compared to all my other basses. I have the reflex and the big Al and they are way louder. It’s just as loud as my passive fender p-bass if not lower. I have changed batteries many times and did not seem to make a difference. I would love to take this bass to San Luis Obispo to have it looked at. Can I just come in during business hours? I love this bass the way the neck plays.

Does anyone else have this problem with the Classic Sabre?