It's likely those codes are just history codes from however long ago. Disconnecting the battery for a half hour should clear the memory. If you want you can disconnect the battery on both ends, let it sit for 30min and then touch the cables together to fully discharge.

Look up triple edge performance, he builds these transmissions for a living and has several common issues listed on the website. See if anything lines up there. Also the transmission is called the 4T65e HD in your vehicle.