your major things to look at is your furnace / hvac unit, how old is it, ask if there has been repairs to it and how often ( if repaired every year for something, that's a sign it's not good) hot water heater, how old is it -  your roof, find out when it was installed, does it look worn  - Appliances, how old are they  - kitchen cabinets, need replacing - siding, any damage, rot - interior floors, broken worn, do they need to be replaced - bathrooms, would you want to use them, do they need replacing - painting, interior, exterior - plumbing, any signs of leaks - foundation, any cracks. i have an inspection sheet for tenant move in/ out on the site: https://www.biggerpockets.com/files/user/kidsalot/... that was PDF or if you want it for OneNote: https://www.biggerpockets.com/files/user/kidsalot/...which you can probably use to check out a house before you buy that goes room by room. or this simple property inspection list in one note: https://www.biggerpockets.com/files/user/kidsalot/...or excel: https://www.biggerpockets.com/files/user/kidsalot/...

IPhone or Android?

As we proceed from using commodities for wealth storage, to using dollars, to using Bitcoin and other forms of digital currency (ACH, electronic transfers, iPhone payments, PayPay, automatic bill paying), it becomes easier for crooks and to steal and governments to confiscate  the wealth.Real estate has the advantage of being very hard to duplicate, forge or transfer electronically.

My last property had a leak in the kitchen water line in the crawlspace.

But, MLS does not have any recent sales of that type of house with all the copper stolen, a leaking roof, rotted carpet and wrecked out cabinets. 

If you are the guy who wants to be a landlord and turn a wrench every time a toilet leaks, then don't do out of town.  

I've checked gutters and there does not seem to be any leaks or puddling in this area (although I've noticed very soggy mud when it rains a lot)For the time being I am going to dig it down a little, put a plastic liner type down, then add soil and grade it away from the house.

@Leo Maldonado Mold + Structural Problems + Leaking Sewage = Dead Cash Cow.

I am sure your ac person already told you this but this is a huge amount of freon so you have a major leak or a leak that has been going on for quite a while.  

Drain lines really depends on the material and age - 50s and 60s copper drain pipes are getting real thin through electrolysis by now and develop hidden leaks.