Check your fuses. There is a power-train control module that may not be getting power.
If not check the wiring harness' from the transmission. There are several. Check for chaffing anywhere along the line.
P1747 - Electronic Pressure Control Solenoid - Short circuit
P0755 - Shift Solenoid 'B' Malfunction
P0743 Torque Converter Clutch (TCC) Solenoid Circuit Electrical
Before you changed the shift solenoid, you had the same errors?
Short circuit could happen because of broken shift solenoid. Could also be an electrically error in EPC.