A 74-year-old man had a facial nerve tumor resected elsewhere 9 months ago based on a 6 month clinical history of facial palsy (unclear if complete or partial) and a radiological suspicion of a mastoid facial nerve schwannoma. No tumor was described in the pathological report (angioma?). The nerve defect was reconstructed with a greater auricular nerve graft with no recovery. The patient was seen in our unit with 15 months of flaccid paralysis. Otoscopy shows canal wall down a cavity obliterated with soft tissue (tiny meatoplasty). Diffusion MRI suggests cholesteatoma in the cavity. What would you do now?