Unless you are familiar with your home’s wiring, contact an electrician. If you are comfortable with replacing receptacles, to begin, TURN THE BREAKER OFF AND USE A HANDHELD VOLTAGE TESTER TO CONFIRM POWER IS OFF at the outlet that you believe is the most likely to be first in the circuit. Remove the outlet and cap the wires. Turn the breaker back on and test the other outlets. If you chose correctly,
all the others will be dead. If you chose incorrectly, TURN THE BREAKER OFF and put the original outlet back in, and try another. Repeat the process until the first receptacle in the circuit is found.