From what you are saying and the info at hand, it looks like a no-go.
Fwd annunciator lts inop? Go-if.....O/head annunciator lts ok but one allowed inop.
O/head annunciator lts inop? Go-only if one inop and fwd lts ok...etc.
If all O/head annunciator lts inop? No-go.
I think..
