Adcom GFP-555 Mods

I joined due to this thread: https://www.diyaudio.com/community/threads/adcom-gfp-555-upgrades-from-audioxpress.277484/

I just recently got into "HiFI" or vintage stereo gear from the 80s and 90s. I've been pretty much focused on Adcom and Cerwin Vegas (I know, many don't like them but I love mine). Anyhow, I love my GFP-555, but I'd like to upgrade it - mainly with a remote control for gain/volume.

I keep finding references to an article by Charles Hansen, but like the OP in the linked thread above - I can't find it anywhere online.

Any help would be appreciated. I'm in the process of picking up a second GFP-555 (might be a 555 II) off eBay that needs work, and thought it might be the perfect candidate for this project. As a HAM, I'm not afraid to use my soldering iron :)

Thanks for the input! Looking forward to yet another forum to use.