[ICOM] Icom 775 DSP audio

[Bill Wehling]

My Icom 775 suddenly developed an unusual issue.  The audio is way down and somewhat distorted.  If you turn the RF gain down, you begin to hear a tone, all the way down and nothing but tone.  Also, the volume control only seems to work to about half way, then there is no more gain.
Anyone seen this before? Before I go tearing into the radio, counting on tribal knowledge to point me in the right direction...
Thanks
Bill Wehling 
Amateur radio N5VE