Yeah, you are probably missing the final weaver scene, in week 6. From the piratepad guide:
-Forbidden Wing requires seen the Weaver scenes in Week 1 and 3 + Secrets has to be 50 and above | Needs at least 275 Interpersonal Insight
Yep, that was it. Had 275 Interpersonal Insight but investigating the noise gave me -5 for +10 courage and that would always put me just under the amount required lol.
