Your best bet is to contact say like L & M Leg Band here in California, if the leg band was imprinted through L & M then they could have a contact number - so give them the leg and code and all and give that a try ...
http://home.earthlink.net/~lmbird/This is a shot in the dark but in searching... for a D & M name search, I come up with this one website but they show mostly Cockatiels and Parakeets but I can not tell that they show the Lineolated, does not look like they are Lineolated. If you read on their About Us page the man's name starts with a D and the lady's name starts with a M. It may not be the one you are looking for. They show that they do not ship and you look like you are in Wisconsin but some how a bird could wind up in another state through someone else anyway here is the link ...
http://home.cfl.rr.com/familybirds/ I havea feeling this is not the people you are looking for. Good Luck. It's like finding a needle in a haystack!!