Arrived on site for persistent issue of tub and shower that are back to back backing up. When tub was ran it would back up into the shower and when the shower was ran it went back into the tub. Homeowner showed me pictures of tub and shower backed up this morning but upon arrival both tub and shower had drained. After looking at the previous notes decided that the best point of entry would be through the vent on the roof. Ran flex shaft from roof, drop is about 15 to 20 feet before it 90s and it goes to the cast-iron main line. I was able to send all 70 feet of flex shaft with no issues. Upon retrieval of line found there to be some hair and that was it. Filled bathtub and let it drain and it did not back up into the shower, ran tub four more times and had no issues in the shower. On the last run of the tub, ran shower at the same time while tub was draining and there were no issues and drains operated normally. At this time both tub and shower are operational, have informed homeowner