Thank you for considering that @JimHowell1970,
I could track back the issues to be somewhere between the cue channel and the headphone jack. When putting everything together one of the hexnuts on the Stereo got stuck and wreaked havoc on the miniswitch and PCB. I'll have some big cleanup to do now first.
The Machine: https://www.modulargrid.net/e/racks/view/1601144