Duntech repairs?

Hello, I just acquired an early pair of Marquis. The previous owner says they are all original but one driver is clearly different. I contacted Duntech and they said they had NOS Vifa recone kits but did not give me pricing and would only recommended I sell the old Marquis and buy the new Marquis model from them when released. I have asked for information (removal proceedure) to verify drivers and repair/recone pricing three times but they have not responded. Any advice from vintage Duntech or Dunlavy owners?