Identifying Hyper Neo Geo 64 Boards

Among some boards I picked up today were two that appear to belong to the NG64 family, but I can't seem to find anything searching the board identifiers. The boards are LVS-DOA and LVS-PAV. Anybody know what they're for? They were near Beast Busters: Second Nightmare, so presumably belong to that, but no idea their purpose.

Found my answers in the wiring diagram.

Both boards do indeed go to Beast Busters: Second Nightmare. LVA-DOA is the digital driver PCB and LVS-PAV is the audio power amp pcb.