The new tenant who moved in last fall said the lint trap/plastic for it for this dryer just broke and needs to be replaced as it keeps falling out while drying and makes a lot of noise.

While putting the new ceilings (dry wall) I have noticed that there is no insulation present between the roof and where drywall goes (The space between roof and ceilings dry walls).

If you get a good number through a broker that lead source will dry up because you just cut their incentive to feed you deals.  

Unfortunately the market in Colorado has gotten quite competitive and those kind of deals have dried up. 

If this place started with clay pipes and sat unused for several years (which would allow the sewer lines to completely dry out, possibly causing more shifting of the individual pipes) then I think this is on you, not the tenant.Replace the whole line. 

I would do a thorough search of every piece of dry wall and any other surface that is around the shower and go look at it in the attic as well.Generally speaking there is only a handful of mold types that are dangerous.

I don't want to be 'high and dry' with their issues and non-payment. 

There's even some late investing strategies our clients use to reconvert to rental then sell later and buy passive 1031 opportunities to hold till death and the step up in basis.The key points to remember are that delay of taxes (paying homage to watching paint dry and the World Cup here) is still a very valid strategy. 

I always felt like the house was dry but the humidity meter showed it was fine.My husband then changed out all the recessed lights to airtight lights and on a few of them they used fire safe caulk.

If they have more than one bathroom this would work as it has to dry a couple days at least, if not have it replaced to keep a 13 year tenant happy.