I am a novice with electricity. I unplugged what I believe was an open circuit (shotty wiring). Plugged it back in an everything returns to normal after resetting breakers. However, I switched off the subpanel (professionally wired for the hottub, microwave and NW dining room) and then, when I reset it, only the living room regain its power. It is 25F outside and the tub is still hot but I am unsure as to the safety of the plumbing (not a question for here) - I need to know what I can do to further check the breaker box and subpanel to possibly regain power.

Thank you.
ATRQ

Turn the breakers off then on again. After that check for any GFCI devices.