I found the Marvell hdd controller becomes very hot in original board. That makes me think the board has a damaged chip although the motor can still spin.

If so drive shouldn't spin with native PCB ....

Unless the ROM chip got damaged while moving it to the new PCB ...

That chance is low as I’m a chip designer and know how to handle this. Also the donor board can spin the hard drive with its own ROM but not the ROM from the original board. That make me think the MCU might have a portion of ROM as well. Both need be matched.

Could you upload ROM dumps for the patient and donor? FWIW, I notice that some ROMs have references to a "HRK Fuse" which I suspect is some kind of Hardware Root Key or Hidden Root Key.

PCBs are replaceable on Rosewood drives.

Yes, the drive cannot spin w/o working Marvell chip and working flash with correct FW content.

Your statements are a little vague. Are we to understand that, in the case of a PCB failure, a straight board swap and ROM transfer is all that is required, just like a regular F3 drive?