Secured Lending Services seems to be part of NREIS, and I am just guessing this from paying attention to every order or recording they have sent me.  I think what happened was in the "boom" time they had a bunch of smaller companies under IREP (like Unisource, Real Link, Non-Branch IREP Unit, etc) and when some of those slowed down they perhaps consolidated into Secured Lending Services (I'm guessing though).

I will mention that I have noticed that NREIS does pay Secured Lending Services work, so I haven't been too concerned with the name change.  I used to do a lot of work for this group of companies, but for now its a search here, a recording there, and yes I still do their work.  I don't like being paid slower, but having done work for them for soooooo long (11 years) its hard to say go away because thus far, I have always gotten paid (and I'm knocking on wood as I type this LOL).