Troubleshot gfi at front of house not working. Found neutrals burned up in the main panel because of loose connections. Tightened connections and replaced said gfi with a tamper resistant, weather resistant one as required. Performed panel maintenance and tightened all connections in both panels. Found a 2 pole 70 amp breaker feeding the sub panel on number 6 wire, which is only rated for 60 amps. Replaced said breaker with a 60 amp breaker as required. Found neutrals and grounds in the sub panel on the same bar. Furnished, wired, and installed a new bar for the grounds and separated the neutrals and grounds and required. Furnished a connector for the sub panel as there was an open knockout.