The first thing I checked on IC 23 was the inputs, and they checked fine, but will check them again before purchasing a new IC. And the two outputs come within 2 thousandths of an ohm resistance of each other.
Do I need a replacement with the exact suffix letters? I see 14011 BCPs on E-bay, whereas the chip in the P6 has only BP as the suffix.
If any other points I should check occur to you, please let me know.
Thanks again for the pointers. Very excited that I may have a handle on this.