BEFVP41, SNMP, and mrtg

I would like to use mrtg to try to trouble shoot an issue via SNMP.

Does any one have a list of the OID's, an MIB file, or an mrtg config they are using with mrtg..

I especially in monitoring the inbound and outbound WAN port traffic, but interested to know what else I can pull out of the SNMP tree on this device.

Thanks!