SL/R230: Roof leak MB 2013 SL550
Check the control unit in the right rear of the trunk above the wheel well for any water intrusion. This has been a source of potential shorting that could result in a fire.
Having said that, if you have a MY2013, then you have an R231. While the vario roof on both the R230 and R231 are pretty much the same, you might get better answers asking your question on the R231 forum.
http://benzbits.com/r230/roof/AdjustWindsheildGap.pdf






