Customer called about wanting his sewer line inspected. Upon arrival, inspected area. Building is 3 airplane hangars, mainline starts between the northern most hangars and runs beneath slab to the south, underneath the third hangar. One bathroom in each hangar. Sewer connection is right outside the south wall of the building. Owner is selling and needs to verify that there are no problems in the sewer line. Provided pricing to perform camera work, customer accepted. Accessed the drains via clean out first. Took the camera out as far as it could go 128’. No signs of any damage or clog. Only finding is that the drain is flat which would cause clogging over such a long run. Used the camera on the exterior clean out on the south side. Piping runs straight to the sewer. Inspected, no signs of any blockage. Explained findings to Chris, suggested installing pressure assisted toilets as a fix. Otherwise, cutting up the slab and excavating down to replace the sewer line would be the only option