Lost power to switch box

I switched out my light switches in my house and one of the light switch boxes lost power. I have a vault tester and when I test for voltage, none of the black wires have electric running to them.
The box has 3 sets of wires:
2 sets have a black, white, and bare
1 set has black, red, white & bare (to the ceiling fan)

What I feel has happened is the source has been cut off (somewhere?) and one of the sets is supposed to connect and take power to my light in my wet bar.

The house was built in 1982

When I originally replaced the switch everything worked and then one day it stopped.