Dead End Wire? Help!

[Keith Strehle]

While replacing my toilet I removed the kick panel at the bottom of
the sink vanity. Inside I found the dead end of a piece of white
romex three phase wiring. Looks like it's been chewed off but I can't
find what it was attached to?

This may solve my outlet problems if I can find where it goes. The
end that is still attached goes up behind the microwave?

I really don't want to pull the microwave out unless I have to.

Thanks,

Keith
84FC35SB