Allow the mortar to dry.

Anything necessary to keep the place dry, solid, and secure.

It was examined by a plumber, left to dry out a couple of days and has been fine for four years.People sometimes wonder why basement footage is worth so little. 

That said, unless you're sitting on dry powder (i.e. another stash o' money) you're putting the cart before the horse. 

So long as you have a lease & it's a simple non payment of rent issue it's pretty cut & dry.

Or they added that section later.Concrete is fairly inert once dry, so I would suspect thin wall copper combined with acidic water supply = pinholes.

If you want to live like a slob but its not physically harming my property, then it is what it is....If you have so much stuff that its damaging my investment, then you either change that and pay for the damage repair NOW (not at move out) or I evict you.So if the "clutter" is attracting rodents, insects.... resulting in water damage, mildew, dry rot or other physical damage to the building above reasonable "wear and tear", I don't care if you pay on time..... you fix it or you go.

Obviously I got some dry wall damage, some bubbling, cracks, and discoloring.  

He showed me through a camera inside the heat exchanger what looked to me like cracked dry clay.

I'm risking sounding like a danged fool here but I have a problem that honestly I should've solved 20 years ago. We keep calcium chloride and sand/salt in 5 gallon pails at all our buildings. We keep them in entry way...