@J Scottjust out of curiosity, what happened were one to lose the PDF files stored on their hard drive (in case of a hard drive malfunction etc.)?  

For this reason, if a tenant calls due to a malfunction of the smoke detectors and a technician is dispatched, you can have the following outcomes:Technician determines the smoke detectors were faulty, and replaces - owner chargeTechnician determined the smoke detectors batteries needed replacing - tenant chargeIf written into the lease that the tenant is responsible for such replacement and the detector was easily reachable, - if not or if the tenant is elderly or disabled, assume reasonable accommodation: owner charge=time/labor & tenant charge=battery costWhere the property manager must be mindful is in the allocation of the owner's resources (money).

It has the old roll out windows but none are broken or malfunctioning.

There was a Vice President of sales of a major, national RE company on the property when a simple fill valve malfunctioned.

If she says we'll my lock malfunctioned and I couldn't get in she still should have called you prior to attempting to break door down to gain access.In my opinion she is  responsible for the damage she caused to the door and I'd charge her.I'd take photo's if she says shes not going to pay.. let it ride till she moves out and take damages from security deposit. 

This typically comes from a malfunctioning furnace or hot water heater.  

My concern if I do decide to supply some or all of these items is that I would be liable if a fire extinguisher or escape ladder malfunctioned.

(Unless equipment malfunction) so my employees are happier, the equipment doesn't work as hard, and my clients motive too.

I live in northern Minnesota... regularly 20-30 below zero.The house used to be heated with a natural gas hydronic boiler, the former owner was an electrician and I am thinking the boiler malfunctioned and instead of replacing it he installed electric baseboard heat instead.The pipes for the radiant heat are not hooked up in some areas.

We are not liable for interruption or malfunction in service.