I’ve not opened it up to look, that’s from measuring with a meter when trying to track down a hum on my PTP, I had the motor plate earthed to the plug but the bearing plate and arm grounded to the superline. and that was the resistance between the two. My 552 is currently grounded via the post on the back to the earth pin of a plug while my ND555 is away.
While the superline was away I borrowed a 1:26 SUT to use between SPU Century and a Stageline N and I’m still using it. On the SPU Century with the Stageline powered from the 552 I preferred it to the superline/supercap before and after Naim had modded it.