Upon arrival tech was told the kitchen and laundry line would back up and have draining issues. Customers also stated that one of their toilets was now gurgling. The house is on a septic and has an outdoor cleanout. The septic lid was opened and the tank looks great. The outside cleanout was opened and had no standing water. Tech had customers flush both toilets. One drained, the other did not. Tech was then taken to the crawl space. The laundry and kitchen lines are the furthest away from the septic, they then tie into toilet that would not drain, then the second toilet, then exit the home to the septic. Improper fall and bellies were discovered in multiple places of the drain lines as well as improper connections. Multiple options were giving to snake the main and the kitchen line. Customer chose to do the main line. Customer also pulled the toilet himself. Technician cabled out 50 feet and tested afterwards by running water from the braided water supply line down through the toilet