From a repair tech's perspective, I would just order a new module. Luckily you should be able to order one directly from Apple and have it programmed so you won't have an "unknown part installed" message. https://selfservicerepair.com/home
I'm not sure if you intentionally took your phone swimming, but typically after the device has been opened, you can't trust the liquid resistant seal, even if you do replace it. I don't even trust it brand new out of the box.