I thought about this "hearing aid" ordeal, and realized it's a medical issue, not an FCC issue.
The answer to the "hearing aid RFI" is for the accuser to go see a specialist about it, to get it fixed or updated. The FCC knows that the manufacturer has to filter out the RFI in any equipment, especially being medically related. I'm just surprised no one has mentioned it yet, it's easier to replace the hearing aid than to blame an old radio operator for it. I think that a mobile operator driving by his house would also cause the problem to the hearing aid, that alone would let the radio operator off the hook.
I had a similar incident causing RFI to a neighbor's equipment in the 80s, and all it took was a mobile radio in a car to cause the same problem. I would get calls with complaints from my neighbor even when I wasn't on my radio. Remember both sides have to respond to the FCC complaint not just the accused, if the accuser does nothing to respond, the FCC drops the case. My neighbor found that out. There is a phone number on the letter from the FCC that the accused could call, to get help from the FCC.
We all have to remember that the FCC is on the side of the radio operator "communicating" not the accuser.
If it was up to the accuser .....
"YOU", and not just the accused, would have to turn off your transmitter forever......
What will the FCC response be? Please let us know if you find out.
73