Hi Steve,
Try this:
1) Create this formula and place it on the Group footer#3 Section:
WhilePrintingRecords;
numbervar x;
x := x + 1;
"";
2) Create this formula and place it on the Group Header#2:
WhilePrintingRecords;
numbervar x := 0;
"";
3) Use this formula to conditionally color the group footer 3:
If Remainder (x, 2) <> 0
then crNoColor
else color(241,241,241)
-Abhilash