I was told by contractors that a home may pass an inspection but once someone is living in it and putting daily stress on the house, things will start to malfunction.

Tenant will be responsible for all charges associated with malfunction of the system due to misuse.

Recently, our PM company  responded to a work order to fix a malfunctioning microwave.

As an aside, a contractor told me that a property can pass an inspection but once someone is living there and putting daily stress on the house, things can start to malfunction.

A number of contractors have told me though even if a house can pass most points of an inspection, but once an occupant (the tenant) is living there and putting daily stress on the house, things start to malfunction.

Generally speaking, the responsibility for repairs like this depends on the lease terms and local landlord-tenant laws.If it was a malfunction with the lock (wear and tear), it could be considered the landlord's responsibility to cover the cost, since maintaining the unit in a habitable condition is part of our duty.

I am not able to get the water turned on for my own inspection so I was wanting to see if other investors would Plumbing: "water lines tested and would not hold pressure, the main line from the tank is malfunctioning and allow air to escape."

They are Not responsible for someone's washing machine inside their unit malfunctioning......and it is Totally unreasonable for you to think they should be.  

Malfunctioning meter.You can rule out #3 by asking your PM if there have been any showings of the property around the dates of the high water usage.

I neede this work done so a new furnace could be installed, as the old one malfunctioned earlier this week, leaving me with an occupied property that had no heat.