Codes P0700 and P0742, Torque converter clutch solenoid?

Hello again, I’m hoping you can help me with another issue with my vehicle listed above. I randomly keep getting a P0700 and P0742 code indicating an issue with the torque converter clutch solenoid. It will go away after a few trips then randomly come back on. When it does come on, I’ll get a little added vibration in the vehicle. The next day it will run smoothly and no issues. Eventually the check engine light goes away. Then randomly back on. It seems to only happen at highway speeds. I changed fluid and it did help. Stayed off for a month or so. Hyundai forums say it’s typical of this vehicle and not worth replacing the transmission. I’m wanting to try and replace the solenoid but can’t find the location on my vehicle. This is where I could really use your help. If you can show me where the torque converter clutch solenoid is located on the vehicle listed above I would be very grateful. Any other additional help or advice would also be appreciated. Thank you!