Code U660E, how to remove the solenoid transmission solenoid?

I am having a harsh shifting issue I took the car to a transmission specialist and he recommends it try replacing the third gear solenoid before replacing the valve body assembly.

I am requesting instructions on how to remove the solenoid without disassembling the entire valve body if possible. Otherwise, any write-ups that would be available please. On the valve body as well. This is a V6.

Transmission code : U660E