Section 66 of the Principal Act is amended as follows:(a) by omitting from subsection (1) "Board" first occurring and substituting "Tribunal" ;(b) by omitting from subsection (1) "Board" second occurring and substituting "Tribunal" ;(c) by omitting from subsection (1)(b) "Board" and substituting "Tribunal" ;(d) by omitting from subsection (2) "Board" three times occurring and substituting "Tribunal" .