  By using a model independent Monte Carlo approach, we study the possible
structure of charged and neutral lepton mass matrices, under the assumption of
an U(2) horizontal symmetry (additional to the usual Standard Model ones)
involving the light fermion generations. We assume the most general Majorana
mass matrix for neutrinos. We update the results of our previous similar study,
by inserting in the analysis the recent KamLAND data, that contributed to find
a final solution to the Solar neutrino problem. The introduction of the new
experimental data reduce the allowed regions in the nine dimensional space
parameters, and show that our procedure gives stable solutions.
