Customer had blockage in mainline again affecting downstairs bathroom due to bathroom being lowest point of house. Blockage was again before clean out had to pull toilet and run machine through line several times before being able to clear ran camera through line pass clean out to check for issues of pipe or potential causes for problem. was unable to identify anything as the main source of the issue. Reset toilet and ran water to check for proper drainage function. Informed customer about no warranty with drain stoppages. Customer does have cast-iron piping. Customer could consider redoing piping with PVC to prevent further issues. Gave video of piping to customer.