I have had my KS10s with custom ear molds for a few years and still like them. In the last year or so the receiver in the right stopped working and the left is on the second replacement that just quit. Not under warranty I have replaced them myself. It’s easy enough to do and takes only a few minutes. Costco first told me I need a " special tool" to do this. I had a box of the “special tools” AKA toothpicks to unlock the receiver wire.
The receivers can be purchase on eBay for under $30 and appear to be Phonaks. So I am wondering what is causing them to stop working. I keep them clean and dry.
Calling Costco today for an appointment but in the past they have set them up a long way out.