Has anyone else experienced PTT problems with their FT-100?

When I key the radio TX Light will flicker and the radio transmits a
burst of noise.
When it first started I though it was the Microphone, so I tried the
Microphone from my FT-8100 and it worked fine so I ordered a
replacement Microphone. Now none of the Microphone work on the FT-100
but they all work on the FT-8100. I also have a Heil Headset with
Yaesu Adaptor and it works fine on all radios.
I would really like to get the DTMF Hand mike running since I need
Tones to control remote radios.

Any Suggestions?

Ron
N5HYH