28. The board of directors of an integrated health and social services centre or an unamalgamated institution administers the affairs of such an institution and, if applicable, the affairs of a grouped institution and exercises all their powers except those granted to members of a legal person referred to in section 139 of the Act respecting health services and social services (chapter S-4.2) for the purposes of sections 180, 181.1, 262.1, 322.1 and 327 of that Act. In addition, the board of directors of an integrated centre must obtain consent, by at least a two-thirds majority of the votes cast by the members of a grouped institution it administers, with regard to any decision of a cultural or linguistic nature relating to access to services provided in the facilities of that institution.