I think this is going to be a long shot, but i need to do some rapairs to the main board of a Razer Core X eGPU and will need to find a board diagram. The eGPU is model RC21-013101. The damage is limited to the pads and traces where the PCI-e socket mounts to the board.
The main board also has some markings. Not sure if that could help or not, but they are:
Fiver Lite
FCS
V1.0
2018.03.20
The main board also has some markings. Not sure if that could help or not, but they are:
Fiver Lite
FCS
V1.0
2018.03.20