Yeah, my previous radio was an M8 that I ran for a long time. I had the opportunity to switch to a 4PKS-R while being able to gift the M8 to a friend. He still uses it to this day. That radio lived in a Trinity foam case. When radios get a lot of hours parts wear out.

Chuck, contact Futaba about the problem you are having with your 3pk, you probably could fix it yourself if you can get the parts.

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my 3PK,, has the spectrum module..and spectrum receiver. so its 2.4 frequency... not 72mhz..

Spectrum replied to my inquire of a replacement receiver..
no current receivers will work that the OLD system..
so I will look into a used 3001 receiver.. and install it into my drift car...
as the drift car has a Tower Hobby AM crystal radio