  We study a two loop diagram of propagator type with general parameters
through the Symmetries of Feynman Integrals (SFI) method. We present the SFI
group and equation system, the group invariant in parameter space and a general
representation as a line integral over simpler diagrams. We present close form
expressions for three sectors, each with three or four energy scales, for any
spacetime dimension $d$ as well as the $\epsilon$ expansion. We determine the
singular locus and the diagram's value on it.
