Called out for an issue with GFCI in basement tripping. Found that outside receptacles showed signs of water damage. We installed GFCIs in all separate locations(front outside receptacle, back outside receptacle, and garage) with new in-use covers and plates and used sealant to help prevent water from getting into the receptacle. We replaced a improperly installed 50amp breaker in main panel with the proper breaker. Serviced and tighten all connections in electrical panel. Checked voltage on main breaker(242.6v). Checked voltages on individual breakers in electrical panel(~120v).