is there a way to scan for hardware failure?

Love idle threats.

Why get it fixed? Sell it and purchase another device so you can issue another idle threat on the manufacturer for that product when something goes wrong.

Where are the idle threats from the Microsoft minions in regards to Windows with constant virus, adware, and spyware concerns costing businesses and individuals in the billions year after year after year yet the sheep keep lining up for more.

What's your audio issue?

Why did you try to fix it yourself? Apple would have replaced it.

I fixed it myself. I took it apart and put it back together and now something doesn't work right. And Apple refuses to help me or fix what I messed up for free.

I'm not bashing just trying to understand why you did that, it's cool with me. You probably won't find much help for that here. I don't have any solutions for you. Best bet is to search google for an iPhone repair site. Everyone else here will just tell you that such things violate your warranty and are not sanctioned by Apple and will make smart * comments too you.

Sorry bro.

there is no way to scan for individual hardware failures within the iphone?

No. At least not that is available to end users.

No doubt Apple's engineers have some software/hardware that can analyse what is going on inside an iPhone, but it's not something that is available to end users.

Also, this is a user-to-user forum. You will not get help directly from Apple here - not that they would help you fix a phone you've opened up and that is out of warranty anyway...