Brown spots on the ceiling, possible roof or pipe leak.Cracked walls, possibly from stress due to the house settling.Rusted cast iron piping, time to replace the line.The list goes on and on.

Then it became apparent the irrigation nozzles were routinely spraying water against my house and subsequently that this water was getting in - carpets were damp coming through from padding below.After checking pipes etc with a couple plumbers who found nothing wrong with any pipes in summer and fall 2017 ...

there is nothing wrong with it, most microwaves have that option and do not have to be vented out, even though as a contractor i prefer them to vent out. if the existing pipe already vents out, which it probably does if there is a pipe in the cabinet already. what you would have to do is unscrew the 2 or 3 screws in the top cabinet that screw down into the microwave ( if not there then there may be 2 bolts in the front of the unit behind the cover that have to be loosened) that will loosen the microwave, then its a matter of taking the screws out that hold the fan at the top back, pull the blower fan out and change the direction so that it faces up, screw the fan back to the unit and put the microwave back up and bolting it. check to make sure the fan connects to the duct work, if not, add a piece of sheet metal to connect and seal that joint. btw you may want to unplug the microwave before doing so, just for safety reasons.

The outgoing pipe from the boiler gets hot for about 20 feet, then it is cold by the time the pipe makes a 90 degree vertical turn and rises from the basement to the second floor.

I'm a former CPA, so I track every line item in exhaustive detail and had a couple of good lessons learned. 

A personal Umbrella policy gives an additional limit of liability that kicks in if the Homeowners Liability coverage is exhausted. 

Ideally I'd like my first deal to be a WHOLESALING and grow more comfortable with that process before I attempt a FLIP.STEPS I'VE TAKEN: Aside from writing this exhaustive intro about myself I've attended my local REI group in Sept 2018.

@Brad Mylius Hondros has a weekend only course...kind of exhausting sacrificing your weekends, but it's not a bad option...that's the way I did it...seemed to work well. 

Most common sewer line issues are tree roots growing into the line, or on older properties cast iron pipes. 

I was told there could be a water pipe leak underneath.