HDD repair

Hello,

I have a faulty old HDD I want to try and fix. I have already removed it from its original external chassis (it was a desktop external drive, now reduced to just an ordinary internal HDD, 3.5") and have tried using it with a SATA to USB adapter, and it still beeps every few seconds and seems to restart each time just like before. ***I was wondering if replacing the PCB on the underside (from another HDD of the exact same model) might help?*** That may be the last thing I do before giving up on it.

I noticed some corrosion on the PCB, doesn't seem to be related to any of the capacitors. Could be the culprit, unsure. I couldn't remove it with a pencil eraser, it is likely irreversible, I'm guessing. I see that the PCB only connects to the HDD internals via traces that press against pins, which looks like asking for trouble, but cleaning the oxidation I saw on those traces didn't help.