Cleared main line blockage with k60 sewer machine and evaluated line with the camera once the blockage was cleared. Sewer line is clear of all obstructions at this time. I believe the cause of this issue was waste debris build up lodged in the 90 that turns down to the sewage ejector pump located in the main homes basement. The rear home was just added to the rear of the existing home about 2 years ago. The sewage line for the rear home discharges into a sewage pit located in the main homes basement, then gets pumped out to the main homes sewer system. Looked the entire system over while I was onsite, all seems to be working as it should at this time. Emailed copy of invoice to homeowners email.