Which export licence to use when it is unlikely we can get end user or end use details?

Question

“We have supplied to a +7 country a mechanical part, which in itself ECCN 0.
The part original design intent is for 9A001 but normally civil aero or industrial turbines.
We are now asked to receive back the original goods, make physical mods to meet the same type of design intent but to be applied in a secret military application
What licence? and how should we deal with “”end user and end use”” as we are unlikely to get details ourselves?”

(This question was asked at one of our recent webinars on Export Controls. You can listen to this webinar on our recent webinars page at https://opentoexport.com/info/webinars/)

This question is awaiting an answer
Export Action Plan