For ABS plastics, a Methylene Chloride based solvent
works very very
well. (It does not work very well for ABS+PC blends, however. I
seriously doubt you have any ABS+PC in the ARS33 though, since it is
a pretty modern plastic.)
I repaired mine with MEK. I believe Tenax 7R (which Robert Feldman
mentioned) is based on acetone, so it should be fairly similar.
I checked the MSDS online, and it's Methylene Chloride.