I assume you are talking about SYS_IF_DOWN, because SYS_NODE_DOWN is unrelated to expected interface status.
I see two ways:
1) Create DCIs
2) Change interfaces back to expected UP/DOWN and filter out SYS_IF_DOWN in EPP (with "stop processing" action). Most likely you'll want to change status propagation on interfaces to Normal, this way they will not affect status of the node itself (expect up/downlinks, probably). All these changes can be scripted (in Hook::ConfigurationPoll).
I see two ways:
1) Create DCIs
2) Change interfaces back to expected UP/DOWN and filter out SYS_IF_DOWN in EPP (with "stop processing" action). Most likely you'll want to change status propagation on interfaces to Normal, this way they will not affect status of the node itself (expect up/downlinks, probably). All these changes can be scripted (in Hook::ConfigurationPoll).