Identify failed component
This part might be a surge suppressor, which is basically two power zener diodes in series with opposite polarity.  If so, then this part being fried is a symptom, not the cause.  It may even still be intact, just dissipated a lot of power for a while trying to clamp a voltage to within limits the rest of the circuit can handle.  It could also be failed shorted.

You've got little to lose, so try removing the part and see if the unit works without it.  If so, it means it is now running correctly, but without the benefit of surge protection this part would otherwise provide.  The next surge will blow up even more stuff.

More likely, however, there are other problems.  As I said above, this part being fried is more likely to be a symptom of something else going wrong previously, than the cause of the unit not working now.  Trying to diagnose and then fix it will be a lot more expensive than just getting a new one.

Modern manufacturing techniques have made electronic device much cheaper than they were a few decades earlier, but the flip side is that they are now harder to diagnose and repair.  This makes devices like this disposable when they fail.