I can only comment on the Garrard 401's older brother, the 301. These turntables were built for longevity and 100% duty cycles in broadcast studios. Mine is about 55 years old and as far as I know has never needed any repair or spare parts. The only routine maintenance required was feeding a bit more grease into the main bearing from its built-in grease cup.
It was my dad's and to get it into tip-top shape I have replaced the main bearing with a much bigger one, and replaced the idler wheel and its bearings, the only things which were showing a bit of wear. It was pretty easy to replace most of the springs at the same time.
I have not touched the motor. The only thing I can think of to look out for is flats on the idler wheel, which are a sign that the table has been switched off at the mains while still running.
Mine comes up to full speed in under a second, and stops just as quickly. If you are really fussy about pitch, they have always needed to run for about 10 minutes to warm up.
There's no electronics at all to fail!