Cary SLP-98L DC or Cap Upgrade details

Ok, I know it's been discussed before but I'm really looking for the details in this upgrade to the SLP-98. I've read direct coupled, F1 upgrade, cap upgrade etc...Now can anyone tell me in detail in what each of these mean and what parts/values go where in the unit itself? I also see various cap values in the upgrades in different units, what does that mean and why do I see these Mundorf SGO caps in various units be of different values? Any help would be great appreciated!