Ran water from front lobby rest rooms from lavy sinks for a few minutes to test for any signs of a blockage, with no visible signs flushed both lobby toilets with no signs of blockage or main line stoppage Called tech out previously for drain line to ask about any other potential bathrooms or issues, he pointed out the bathrooms located in the studios not attached to the main hallway Repeated process of running water in both rear bathrooms as well, running the shower and lavy sinks while flushing the toilet however could not recreate the drain issue the customer was having Would like to return and possibly camera from remaining rear toilets, technician is sure there are no existing drain line issues at the time Running the camera will visually verify any remaining potential sources of a drain stoppage Met with carol and pulled manhole covers outside to verify flow of water from the building Noticed some general debris and buildup but water seemed to be flowing otherwise Told c