How robust is the result of the Standard Model Higgs boson search at LEP?

An excess of signal-like events above the expected background, corresponding to approximately three standard deviations, was observed in the search for the Standard Model Higgs boson at LEP in 2000. This excess is consistent with the existence of a Higgs boson with mass 115GeV/c2. Relevant consistency and robustness checks, which further support the signal interpretation, are presented.