  We investigate an excess observed in hadronic events in the archived LEP2
ALEPH data. This excess was observed at preselection level during data-MC
comparisons of four-jet events when no search was being performed. The events
are clustered into four jets and paired such that the mass difference between
the two dijet systems is minimized. The excess occurs in the region
$M_1+M_2\sim 110\mbox{ GeV}$; about half of the excess is concentrated in the
region $M_1\sim 80\mbox{ GeV}$, $M_2\sim 25\mbox{ GeV}$, with a local
significance between $4.7\sigma$ and $5.5\sigma$, depending on assumptions
about hadronization uncertainties. The other half of the events are in a broad
excess near $M_1\sim M_2\sim 55\mbox{ GeV}$; these display a local significance
of $4.1-4.5\sigma$. We investigate the effects of changing the SM QCD Monte
Carlo sample, the jet-clustering algorithm, and the jet rescaling method. We
find that the excess is remarkably robust under these changes, and we find no
source of systematic uncertainty that can explain the excess. No analogue of
the excess is seen at LEP1.
