Dunlavy crossover upgrade? Who is the best to do this?

I have been reading about upgrading the crossovers in my SCIVA,’s and many people are very adamant that you should never touch them because these first order crossovers are perfectly matched to the drivers and enclosure to give you the perfect response to the components. I am sure that is all true but is there anyone out there that I could send these crossovers to that could match them perfectly with like for like (better quality components) and still retain the exact same properties electrically for the original design. I am not very technical on everything that needs to be considered like ESR and other parameters but I am sure the overall impedance has shifted over the years due to degradation of the original components. Obviously I do not have the skills or electrical test equipment to do this. So to the question, is there anyone out there that can do this for me?