You can indeed call Yaesu and talk to the nice part lady and order the parts. However there are none in the supply pipe, so basically you're wasting your time. I talked to the service guy and he said there are NO Final units available.?
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When I talked to the part lady she had no idea if or when said final unit would be available.?
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So when the service guy said no part, and the parts lady says no part, there's a good chance there's no part.
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Mike wb8vge