Update from NAC 52 to NAC 52?

Thanks a lot!
My SC has a fresh service in 2017 or 2018 (must have look in the documenation).
As I remember, the Caps and amplifier are much more “hearable” when updated. Is this correct? I assume it might only be “I know, that it has got an update”
And yess - I know my 52 and it has sounded wonderful for 4 years now (bought it in 18)

here: service
he described an update in sound…