please help.i need to change an old 2 way switch in my hall that serves 2 lights from different positions,with a new double 2 way switch with l1 l2 comm x 2 on the rear.problem is the old switch has on the rear 2 separate blocks with the left one : red wire in 1top of block. black wire in 1c bottom of block ,marked ( intermediate 2way) the other block has.red and blue wire in 1top of block. red and yellow wire in 2top of block and red wire in 1c bottom of block marked ( intermediate 2 way ) i have changed all the others with no problems ,but this one has stumped me.