Customer was concerned about the far back to back bathrooms. The other day while kids were showering water began backing up in to both the shower and tub. Also the toilets did not flush completely. However earlier cusotmer has heard a noise and the water level on all fixtures in the back of home began to drain. And thier has been no other issue since. From customer description it seems like they may have had a soft blockage/clog in the 3" cast iron drain that runs through crawl space across house toward garage and master bathroom. They said that they had no issue with master bathroom at all. Advised customer to monitor the situation and if issue with back bathroom drains returns or becomes a frequent occurrence there maybe an obstruction in the 3" cast iron drain that runs across the crawl space. It could be possible to snake but as the cast iron is orignal tothe home it may require a repair. Another issue customer had noticed is that the far bathroom ensuite toilet was slow to