Restoring the TDA8920TH from Philips Stereo.

Hi,
So I want to restore the amp and PSU that I took out from an old Philips FWD750, I just want the aux functionality but I realized the aux inputs to MUX which send the signal and receives it back from another circuit board to communicate with IR sensors from the remote, I am planning to get the output without sending the signal to the other board just using the PSU and the main board. My initial Idea is to simulate the orginal layout in KiCad and try and get the output signals, however I can't find the Pspice model for TDA8920TH is the simulation neccesary or I can get the output just via inspection and changing or adding some circuit elements?
 

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