For the seemingly extravagant price of the upgrade/overhaul, I would require some very serious deficiencies in the setup and take some time to audition alternatives. In other words, I think you could find either a used or a new turntable/arm/cartridge combination that would be very, very satisfying. Perhaps you could even find an LP12 that fits your needs and is ready to go for somewhere around that price. Personally, I wouldn't pay that much for the services offered.
Repair Linn turntable vs buying a different one
Dear turntable experts:
I would very much like you opinion and recommendation if I should go ahead with repair my old Linn LP12 turntable system which has Karma cartridge and Ittok tone arm. If the repair job include replacing with Krystal cartridge and Akito tone arm plus Linn cable and other misc parts, the cost of parts is about $6000 plus labor, with estimated cost of about &7000 total. Would there be advantage of proceeding to do the repair of the Linn turntable system vs. buy some other turntable at equivalent of $7000? Thank you very much.