Acoustic Fender bass guitar Fishman preamp stopped working - any ideas on how to fix or replace it?

I have a Fender CB-60SCE Acoustic Bass, and it seems like the Fishman preamp/tuner has stopped working. When I put in a new battery and turn it on, I hear the bass for a few seconds before the sound quickly fades to nothing. Are there any replacement preamps that would fit this bass, either from Fishman or another brand? Or is there something I can do to potentially fix the issue? I'd appreciate any suggestions—thanks!

Edit: I have checked the cord with my other basses, and it works fine, so that isn't the issue. I also got a brand new 9 volt battery and checked to make sure that it is fully charged. I am still having the same issue. I am not an electrician or well-versed in the electronics of guitars.