Replacing the GMR sensor or any other solution?

Hello gurus,

I have one hard case now.
It is a quantum LCT20, with 3 head and 30GB capacity.
Comes to me with the typical clicking sound. (servo not found)
I have measured the preamp's connector, and looks good.
I have replaced the pcb, and the donor drive was happy with my patient pcb.

I have replaced the MHA, but of course, the alignment was different, and this model is rare now.

I have measured the MR sensors individually (preamp removed), and really, the H0 shows different value.

This drive have more than 2 head, so, i think the attempt for alignment is only waste of time.

The density is not too high in this model, i am thinking about replacing somehow the head itself.
Somebody have done this before with success?

If somebody have any solution or trick for this case, please PM me!

Any help will be appreciated.

Thanks,
Janos