If one is prepared to invest the time learning anyone can. These are beautifully made machines built to a standard designed to stand 24/7 running in broadcast environments etc. The build quality is just out of this world compared to typical hi-fi kit. In most cases one only needs to disassemble, thoroughly clean out all the congealed and sticky oil and grease, re-lube and reassemble. Some of the rubber parts (the various grommets around the speed change assembly etc) may need some work to bring back, maybe only a thorough wash in some warm soapy water, maybe replacement, and there is a chance the motor bushings may need replacement (they’ll certainly need cleaning out and re-loading with oil), but it is all doable.
I have to admit the third-party boutique service industry triggers me to quite a high degree. I believe firmly in Right To Repair and in freely sharing knowledge and enabling people to work on their own kit. I am disappointed by the amount of obvious mystique and FUD that emanates from some quarters. It just grates with me. The simple fact is there are no Garrard or Thorens “experts” beyond the self-appointed. The people who designed and built these turntables are long gone now. Not one will have had any factory training and we are all learning and making it up as we go along. There is also nothing magical in these wonderful turntables. It is just solid sensible zero-hype engineering. Anyone one with a reasonably functioning brain and grasp of mechanical engineering can work on these decks if they carefully research the design and any pitfalls in advance. Don’t just dive straight in with a screwdriver, download any literature, read the various forums, see what is on YouTube etc, show respect, never force anything and you’ll get there. The Lenco community is leading us all, so much freedom of information and support there.