hifi engine

Sonic Frontiers Assemblage ST-40 tube power amp info.

Hi all,
I have a Sonic Frontiers Assemblage ST-40 tube amp. It was a kit put out through The Parts Connection from Canada.
The original owner did a good job on assembly in the late '90's. It sounds great, but there was a upgrade kit made available then. Would anyone have any info if the kit or at least the parts needed and assembly instructions are still around ?
Thanks for any help. Mike