I got a Pro 106 that had a bad DSP chip and wouldn't startup past the "DSP Loader" message. After replacing the DSP it seems to be working except that there is no audio. There is a good audio signal at the demodulator IC and all the signal strength bars show on the display when I tune to a local radio station and the squelch is open with the squelch indicator on the display. The audio amplifier is good too. Could there be a problem with the TLV320aic13c ADC/DAC IC? I don't have a service manual, and I can't find any traces coming out of the digital-to-analog pins, so I am not sure where the audio is supposed to come back from the logic board. Does anyone have a service manual for this who could help me out?