The home button doesn't work, probably fried it, what next?

Heyo,

So, I repair phones for my fellow classmates and friends. Today I got an iPhone 6 with a cracked screen. I replaced the screen in about 45 minutes. While I was transferring the shield plate to the new screen, I was thinking to myself. "This repair can't go smooth.". Then I noticed that the battery wasn't disconnected (The phone was off though). After I slapped myself in the face for being so stupid, I disconnected it and continued with the screen transfer. When I connected everything up again and booted the device back on, "Touch ID Could not be enabled". I knew I was in a lot of trouble at this point, the home button wasn't working either. My guess is that I fried the little home button circuit board when I unplugged it with the battery still connected, and then shorted out the poor thing. What can I try to potentially fix it? What should I do/tell the customer? Should I let apple replace the home button with me leaving no profit? or is that unnecessary?

Thanks

-Jort