You need to measure the resistance of the tweeter, it should test between 4 and 5 Ohms, if higher, probably a blown tweeter. It is not difficult to fix. Contact B&W support (https://www.bowerswilkins.com/support), they will send you instructions on how to do the repair. Instructions often include a video showing clearly how to do the work. Just had very good experience with B&W support to replace a tweeter on N801 speakers. As an alternative, B&W support can also give you the name of a local repair shop/dealer who can do the work for you.
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This B&W site includes all the service manuals:
This site shows a parts list for all B&W speakers:
Scrolling down to the N805 speaker, the tweeter is $144 (p/n ZZ11266).
Is it possible that you may have damaged something in the crossover? I ask because I had a pair of Vandersteen 2ce speakers in which both tweeters weren't working. I ordered a new set from Vandersteen after giving them the serial #and put them in 6 days later when they came in. There was no sound out of them either. Turns out the crossovers had blown parts and needed rebuilding. In my case it turned out a Yaquin cheap piece of junk Integrated blew my crossovers out and 2 days later, caught on fire.