So it is possible the blockage was originally caused by someone next door, a blockage formed downstream of the wye, but since it's vacant, no one sent anything down the drain to trigger any symptoms. 

one issue is if you bought 30k properties they are probably fairly old and will constantly need up keep could be a symptom of the asset its self.

Thus, I feel like my heavy cough symptoms, and inability to run/exercise for long period may be due to mold issues stemming from this roof.  

Others here, close to the CDN border, just cross over for much cheaper CDN Rx fulfillments, especially diabetic supplies.

Bottom line , shutting the system off and waiting may have temporarily treated a symptom but would not have fixed the problem.

@Matthew Paul and @Joe Splitrock, my classic symptom of a toy, or an ink pen, or a similar object in the toilet is a slow flush or no flush (for a while) until the clogged toilet paper wrapped and bunched up around the object dissolves. 

They may be medical alert dogs that warn their owners of impending diabetic crises, seizures, etc.

Stokes Jr:@Joe Villeneuve you lost me If the house gets the symptoms (fever, coughing, trouble breathing), don't buy the house. 

If you suffer from PTSD, anxiety, depression, or are generally unable to handle difficulties in life, please don't read any further.Emotional Support Animals are merely a symptom of an ever-weakening society.

@Lucas Carl The only tenant I ever had that rose to that level of crazy was NPD (narcissistic personality disorder); he actually told me that-- and I believe it because he had all the symptoms.