Last year my Costco Bernafon died, Costco said it was too old (2010) to fool with.
I searched this forum for “hearing aid repair” and found a thread in which one of the members recommended http://directhearingaidservice.com/16 in California.
Contacted him to verify whether he still recommended them. He did.
Long story short, Thomas at http://directhearingaidservice.com/ fixed my Bernafon, for not much money, and it works fine. I recommend him and think you would do well to contact him about repairing your aid.
Full disclosure - in the meantime I “upgraded” to a Phonak and haven’t used the repaired Bernafon much for the last 10 months or so - only when the Phonak is being repaired by Phonak - so I can’t speak to the long-term reliability of the repair, but you never know.
And looking at your location, he is within shouting distance - same state, same part of the state.
Best of luck getting your instrument fixed!