Is there a way to search through a CDT array variable on select set of fields?

I'd recommend using wherecontains in combination with intersection. This will allow you to look at each field individually, then combine the results. Something like this:
intersection(
          index(ri!cdtList, wherecontains(val1, ri!cdtList.field1), {}),
          index(ri!cdtList, wherecontains(val2, ri!cdtList.field2), {}),
          index(ri!cdtList, wherecontains(val3, ri!cdtList.field3), {})
)

Yeah, I was trying to avoid multiple searches and having to intersect them. Just looking to see if there was a more efficient way of doing this. But, it works. Thanks Jacob.