Throwing this out there because there are actual people working in industry that can share where non agency CMBS/RMBS indices are at. Markit used to have a free site showing this as well as 1 or 2 other sites, but in the aftermath of '08 they are all gone. I googled. Thanks.
Throw me a BBG ticker that you are specifically looking for? Markit iBox Broad RMBS TR Index is at 305, up 6 on the day but still well off the highs of 380+ a month ago, if that helps.
Not sure of the BBG ticker but these ones: https://ihsmarkit.com/products/us-non-agency-rmbs.html ABX.HE, PrimeX https://ihsmarkit.com/products/markit-cmbx.html CMBX.NA.AAA, CMBX.NA.BBB Any color as to where those indices are at: recent drawdown, YTD, etc is much appreciated sle.