  We consider the lattice realization of the Standard Model with an additional
$Z_6$ symmetry. Numerical simulations were performed on the asymmetric lattice,
which corresponds to the finite temperature theory. Our choice of parameters
corresponds to large Higgs masses ($M_H > 90$ Gev). The phase diagram was
investigated and has been found to be different from that of the usual lattice
realization of the Standard Model. It has been found, that the
confinement-deconfinement phase transition lines for the SU(2) and SU(3) fields
coincide. The transition line between Higgs and symmetric deconfinement parts
of the phase diagram and the confinement-deconfinement transition line meet in
a triple point. The transition between Higgs and symmetric parts of the phase
diagram corresponds to the finite temperature electroweak transition/crossover.
We see for the first time evidence that Nambu monopoles are condensed at
$T>T_c$ while at $T<T_c$ their condensate vanishes.
