1-2-24 Descaled approximately 50' of 4" cast iron pipe from a 4" floor cleanout located near the bathroom entrance downstream to just before connection to main line. Vacuumed loose scale out of the lines and got measurements for sewer lining tomorrow. 1-3-24 Inserted a 4” liner through the floor clean-out near the f wing extending approximately 50' downstream ending in the drop just before the connection to the main line. Reinstated 3 connections with robotic cutter.