reference request – $mathcal{D}_lambda$ modules $mathcal{D}_{0}$ modules equivalence

Fix $G$ a finite dimensional reductive group and $lambda$ a weight. Apparently the category of $mathcal{D}_lambda$ modules on $G/B$ is equivalent to $mathcal{D}_0$ modules on $G’/B’$ for a different group $G’$, whose Weyl algebra $W’$ are the elements $win W$ with $wlambda-lambda$ integral. Apparently this is due to Lustzig, where it is covered in the language of monodromic sheaves.

Question: is there a modern reference for this?