Whatever its condition before (it was already dying), opening it up has sealed the deal on its demise.
Before you opened it up, a warranty replacement was a possibility. Now, you're out of luck.
The data on it? That's what backups are for.
Sorry to say, it is dead dead dead.
It was dead before you opened it.
Drives die. All of them. Some sooner rather than later.
This is why we preach backup backup backup.