dmitryk

Replacing PCB back and force will not void the warranty. Obviously you will need to put original PCB back.

The problem that it will not do any good for you.

Cooking drive in Microwave will void the warranty. In addition it will not erase any data on your drive other then damging electronics and providing traces of blown componets, rice and crums on the drive :)

It is not possible to swap PCB on the modern drive without additional work. Segate when drive is refrubished will wipe the data off. So don't worry about that.
But if you want data recovered and you want it to be under warrany you will need to call Seagate Data Recovery Service. They are the only ones who certified to work under warranty with Seagate drives.