I did a head swap and the drive ran fine for a couple minutes on the DDI. Initialized, recognized, head map worked, and made it about 2%. Then after DDI timed out on a sector (first pass) and repowered the drive the original problem came back to haunt me. Anyone experience this and am I wasting my time by replacing the heads a second time.

If by original problem you mean dead heads then it's probably MD

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SAN, NAS, RAID, Server, and HDD Data Recovery.

Motor tested fine, PCB fine, minimal debris on top platter no head on last platter. Are these drive known for degrading media (flaking)? The Original problem was click, clunk, click, clunk, etc. not recognized by anything.

Why you ask all these unnecessary questions?

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SAN, NAS, RAID, Server, and HDD Data Recovery.

I was hoping that someone like you, with your infinite wisdom, would be able to tell us if there is a solution to the issue. Something like, PC3000, Linux, Knopix (it reads anything), try clearing by high pressure source or this has worked for me in the past. Something useful!

If it's media damage then the surface with MD is probably unrecoverable. I thought that's common sense.
At least it would be common sense for a DR person

You asking so many questions but all what you need to do is go and check surface for MD. Do some work already

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SAN, NAS, RAID, Server, and HDD Data Recovery.

Given that fresh heads recognized the drive, if it was your customer, would you try another head swap and image from max LBA back to zero or would you call it a day. Fresh heads must be reading the negative sectors. I do not have the capability to examine the lower platter without extraction. From what I can see with the microscope and the inspection of the filter MD is nil.

P.S.

Like the attitude. I had a Drill Sargent like you.

I would try another HSA. First one worked at least for 15-20 minutes (I guess), so it's not an instant killer

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SAN, NAS, RAID, Server, and HDD Data Recovery.