I have replaced my GFI an dhad it working for about 2 months. Then something tripped it and when I reset it I have power from the GFI switch to a light (next) to it but no power into my bathroom or the outside receptacle. When I plug in a tester it reads open neutral. So how do I fix? Any help will be appreciated thank you Dennis

Turn breaker off. Check the wires on the receptacles to make sure they have not become loose or came off. Also make sure the supply wires to the GFCI are connected to the "LINE" terminals.