Attached is the protection circuit schematic and the readings at the various pins in Red. There is clearly some differences from the schematic. Most notable, -71 at pin 2 instead of -60, which seems a little too high and the Left and Right input pins (8 & 5 respectively) both start at -3 volts and count up through the 8 second startup but end at different values. Pin 8 (left) ends at -0.150 whereas pin 5 (right) ends at positive 0.33, roughly for those. Pin 10 is also a little higher at 80v vs 76v, but it seems the other areas might be more of concern?