@AmigaOfRochester I have an SE LB that will boot but the adb is not working, mouse pointer stuck in Lfet side top corner and the keyboard doesn't work. Would you be interested in having a go at it?
I have found this thread totally fascinating. My SE has just died in the last couple of weeks (will no longer boot and when it did once the adb is locked up) I'm thinking a new built board might be my saviour.