Do to determine which VM's are bound to a network adapter(s) in a vSwitch

Lets say for instance I have an ESX server 3.02/3.0.3 with 4 NIC's grouped to a single vSwitch.  I have many VM's on this ESX server.

During production hours a physical NIC is having problems sending and receiving data.

How do I determine which vmnic each VM is bound to?  Obviously VirtualCenter doesn't contain this data.  Where would I look in the Service Console to find this data?  I would assume that the /proc folder would contain some sort of data/info to map the VM's to their associated physical NIC?

Thanks!