The resonance cavity was failing.
Not catastrophically. Not in a way the Grand Ordinator — before his administrative function had reached its terminal entry — would have flagged in a quarterly report. The failure was occurring at the boundary where the fifth head's temporal awareness interfaced with the Spire's structural geometry, and it was producing a vibration in the condenser's load-bearing mathematics that Zephyr calculated would compound into instability within seven months.
Seven months was five weeks before the Vigil window.
Zephyr ran the diagnosis twice, not because he doubted the first result, but because his cognitive process was disciplined: no single reading of a structural failure was sufficient until confirmed by an independent pass. The second pass confirmed the first. The resonance cavity's temporal pressure load was exceeding what the Spire's designed architecture could safely contain.
