[TenTec] Plug 52 Mod Query?

[Scott Walker]

"Plug 52 is the well know cure for clicky QSK in your headphones. It's on
the
logic board and control board. Just unplug it. QSK will greatly improve. No
one understands why it's there in the first place. Also, unplugging it will
allow your AF gain to control the sidetone as it should.
Steve N4LQ"

Does this modification also apply to a 1992-manufactured Model 563 with the
Option 3 upgrade?
Thanks.
-Scott  N3SW