  Recent measurements at LHC has inspired searches for TeV scale left-right
gauge theory originating from grand unified theories. We show that inclusion of
Planck-scale induced effects due to ${\rm dim.}5$ operator not only does away
with all the additional intermediate symmetries, but also it predicts the
minimal set of light Higgs scalars tailored after neutrino masses and dilepton,
or trilepton signals. The heavy-light neutrino mixings are predicted from
charged fermion mass fits in $SO(10)$ and LFV constraints which lead to new
predictions for dilepton or trilepton production signals. Including
fine-structure constant matching and two-loop, and threshold effects predicts
$M_{W_R}= g_{2R}\times 10^{4.3\pm 1.5 \pm 0.2}$ GeV and proton lifetime
$\tau_p=10^{36.15\pm 5.8\pm 0.2}$ yrs with $W_R$ gauge boson coupling
$g_{2R}=0.56-0.57$. Predictions on lepton flavour and lepton number violations
are accessible to ongoing experiments. Current CMS data on di-electron excess
at $\sqrt s= 8$ TeV are found to be consistent with $W_R$ gauge boson mass
$M_{W_R}\ge 1.9-2.2$ TeV which also agrees with the values obtained from dijet
resonance production data. We also discuss plausible explanations for diboson
production excesses observed at LHC and make predictions expected at $\sqrt s
=14$ TeV
