Ronald Held wrote:
The Breen found the android factory in "the persistence of memory". In that trilogy the Breen could not incept them so they went the telepresence route Akharin constructed androids before Soong but were they positronic?
You are right. I had forgotten that the Breen seem to have found
that factory. It had probably been constructed by Lore.
The Breen were able to activate at least 3 postitronic androids and to program them. It wasn't clear to me how well their scientists understood their workings.