Congrats on the litter!
I myself have never encounterd this before and can not imagine the stress of not knowing what is best to do is doing to you. I found this site on Blue, Golden and Chocolate born Yorkies. It seems like she has done her reasearch. This may help you make an informed decision on what to do.
Goldenray Genetics Chocolate Yorkies Red Golden or Yorkie Blue Borns CDA