Starkey is another Manufacturer that I understand has done repairs on various other brand HAs for patients. I think I got a quote once from my local audiologist for my older Phonak Perseo ITC and the price was something like $340 per HA. Not all that cheap either I thought.
I have used these people for total recasing and repair of these HAs I mention above on a few instances, with broken battery doors, which some audis told me could not be fixed. A cock and bull story about the Chipset being permanently attached to the inside of the Faceplate and could not be removed without destroying the Chipset. Just wanted to sell me a new pair of HAs was all at the time.
What one is often not aware of, is that many maker’s HAs are a consist of often many generic off the shelf parts made by other manufacturers in the world, and can be gotten, contrary what any given company might say. That many components used are not quite so “proprietary”.
This company I link to did beautiful work. I still have those HAs as spares, as I now wear Phonak’s latest Virto V-90 ITC. The old Perseos look and work as new.
Here’s their website, good business if you should choose or need repairs on any HA once out of warrantee.
They can recase ITC-ITE with locally gotten new impressions, replace Mics, or Speakers, upgrade analog aids to digital, etc.
Hope this helps.