HP has not been posting proper service manuals for a while. However, we can say that the keyboard is embedded in the top cover. Even if there were a backlit keyboard part available it would be very hard to locate and would come only as part of a whole top cover, which is expensive. And replacing the top cover is a major tech task. Hours of labor. So it seems like this should be an easy matter but it is anything but easy and reasonable to do.
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