Licensed and insured GC's with a good reputation are worth their cost.

Account ClosedThe principal theory behind a 'specified service trade or business' (SSTB) is that these trade or business lines encompass businesses where the primary asset and revenue driver is the reputation or skill of the owners and/or employees. 

This is a practice by some less than reputable companies.

Does anyone know a reputable hard money lender in Las Vegas or the surrounding area's that would be able to help me with my request?

I bring 40K to the deal and he brings the lender in his company’s name because he has a reputation with them already.

Secondly, someone with a good reputation and good customer service.

I would also consider paying a professional plumber if people think thats a better idea.  

Is there a free way, or a reputable online screening service for this?

Lots of great resources and information on here.I wholesale in Phoenix and could also recommend some contractors as well (Although I would recommend getting bids from several different contractors to familiarize yourself with price points).As far as hard money is concerned, Boomerang Capital / CapFund1 / Merchants / Clear Mortgage are all great reputable lenders in the area.Feel free to PM me if you ever want to chat

To donate the property.I am going to guess it may be best to sell for market value and take the loss.Check with a very good reputable CPA if you dont have one already.