Also, is he entitled to the security deposit (minus any repair expenses)?

They are not allowed to do any repairs or modifications, none, without written consent.

Identify necessary repairs and improvements.2.

But now I have to make part of the lease and get a signed form.I maintain the property and have emails and texts with the Tenant's requests for maintenance and immediately respond and have acknowledgment from them when the maintenance flks arrive to do repairs. 

Can I split the cost of the plumber and tank repair on both tenants, as they both clearly were using the wipes and it's very hard for me to believe they were NOT flushing them.

The tenants may not like the timelines or outcomes of the repairs - part is on back order, they have to pay for the repair due to abuse, the owner chooses to repair instead of replacing.

Here is my short list:Overestimating the After-Repair Value (ARV):Investors sometimes overestimate the future value of a property after renovation.

PM sent us a laundry list of photos and repairs from damages in the home. $4200. 

On that one, we documented maintenance issues and owner did NOT allow us to repair.

Plus, equipment can be a hefty expense and may need repairs over time.Instead of a conventional treadmill, I would consider a walking pad paired with a height-adjustable desk-- its cheaper and can be hidden/discreetly tucked away.