onepcbsolution.com has replacement boards, but the firmware chip needs to be transplanted to maintain head current flow settings and prevent heads from burning out. onepcbsolution.com can do that.
Replacement of the chip requires hot air soldering equipment or low temperature indium alloy solder, but if the leads of the chip are not visible, that is, the chip is in a BGA package where all the connections are under the chip, then the job is more difficult and requires re-balling the solder connections with a stencil.