Hello,
It would help a bit if we knew the circumstances it got damaged in.
I mean power failure, physical shock, or anything else.
If there had been no special events, it just began clicking, I suppose it is most probably head related, but it can be that some parts on the PCB got damaged (-5V supply, reading channel...)
so first it is neccesary to exclude PCB, then U may think about how to replace the heads
regards,
pepe