Local labor board officials upheld the results of a union election at a Portillo’s food preparation facility in suburban Addison after a series of challenges by the company.

       Regional labor board director Angie Cowan Hamada issued a decision upholding the election results Monday. On Wednesday, the company said it planned to appeal again.

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       Food preparation staff in Addison voted 28 to 20 to unionize with the International Association of Bridge, Structural, Ornamental and Reinforcing Iron Workers in April. Days later, Portillo’s asked the labor board to set the results aside, claiming the union made illegal promises to workers in the run-up to the election, including that union representatives told workers they could qualify for green cards or citizenship if they voted “yes.”