nets {
net unnamed = C24:P2;
net unnamed = VR2:CW_2;
net unnamed = J1:3, J2:3, C4:P2;
net unnamed = C24:P1;
net unnamed = IC2:2OUT;
net unnamed = R10:P1, IC2:1OUT;
net unnamed = R6:P2;
net unnamed = C16:P1, IC3:VCC-, IC4:VCC-;
net unnamed = C27:P1;
net unnamed = C7:P2;
net unnamed = IC3:VCC+, IC4:VCC+;
net unnamed = IC2:1IN-;
net unnamed = VR1:CCW_1, GND:GND, VR3 CCW_2 - R16 P2:GND, VR2:CCW_1, R4 P2 - J2 1:GND, J2:1, C16:P2;
net unnamed = R10:P2;
net unnamed = VR1:CW_1;
net unnamed = IC2:VCC+;
net unnamed = R4:P2;
net unnamed = R4:P1;
net unnamed = C4:P1;
net unnamed = R14:P1;
net unnamed = J2:2;
net unnamed = VR2:WIPER_1;
net unnamed = IC2:1IN+;
net unnamed = VR1:CW_2;
net unnamed = C27:P2;
net IN_L = J1:2;
net unnamed = R11:P2;
net unnamed = VR1:WIPER_2;
net unnamed = C22:P2;
net unnamed = IC2:2IN+;
net unnamed = C11:P1;
net unnamed = IC2:VCC-;
net unnamed = R3:P1;
net unnamed = IC2:2IN-;
net unnamed = C17:P1;
net unnamed = IC3:2IN-;
net unnamed = VR2:WIPER_2;
net unnamed = C11:P2;
net IN_R = J1:1;
net unnamed = VR1:CCW_2;
net unnamed = VR2:CW_1;
net unnamed = C7:P1;
net unnamed = IC3:2OUT;
net unnamed = R11:P1;
net unnamed = R6:P1;
net unnamed = IC3:2IN+;
net unnamed = R3:P2, IC3:1IN-;
net unnamed = C22:P1;
net unnamed = IC3:1OUT;
net unnamed = R14:P2;
net unnamed = VR1:WIPER_1;
net unnamed = VR2:CCW_2;
net unnamed = R13:P1;
net unnamed = IC3:1IN+;
net unnamed = R13:P2;
net unnamed = C17:P2;
}

I hit an issue removing the old front end in one large batch, so I am decomposing the edit into smaller verified steps and continuing with the C28 rebuild.