"incredibly low volume and a ton of sound leakage"に関する回答With very low volume, I fixed mine by using isopropyl alcohol and a qtip/ear bud. Gave it a good deep clean and restored sound perfectly for me.
"change broken lcd with lost apple watch lcd"に関する回答Yes. You can replace your cracked screen from an iCloud Locked unit. Apple does not ban any devices.
"Can iPhone SE logic boards be swapped to access data?"に関する回答Technically, yes. But if the liquid damage is to severe the motherboard may not work at all.