GFCI receptacle in my kitchen is not working after reset. I checked power to receptacle - reads 120V between LIne and GROUND (coming from main panel). Then I checked power directly into the outlet slots and it measures 0 voltage. Replaced GFCI with same results. There are 2 downstream outlets the also have no power. Used stab connections on back of outlet. Unsure what my next step should be - other than calling an electrician.