Just received my B&W 802's: One tweeter doesn't work - HELP!


After testing many new speakers (Magico A3, B&W 801 D4, Wilson Sasha DAW, others) I realized I really, really just liked the tonal balance of my current B&W 803 D2's. Because of this, I sought out a pair of used 802 D2's, as an upgrade that would have the most similar tonal balance. I found a pair of "mint condition" used B&W 802 D2's for sale online, from a very well-reviewed retail shop. After receiving them, I was actually surprised that the speakers were truly, in fact, in mint condition. Everything about them seemed brand new. However, that was until I tried them for the first time and found that one tweeter produces no sound at all. I triple checked all phase connections, and tried removing the jumpers (the mid-range cut out as expected when I removed the jumpers). My questions: 1) Can anyone tell me the most likely cause of a tweeter failing totally where it produces no sound at all, and yet the speaker and tweeter itself visually appears to be in pristine condition? Loose connection internally? Blown crossover and/or tweeter unit? 2) Further to my first question, how would this issue be addressed? 3) How would most reputable retailers respond in this scenario? I've sent the retailer an email (they are closed for today) indicating the issue, along with photos of my connections to prove correct phase, etc, and also a short video showing a recording in front of the speaker with it's tweeter working properly, and moving to the other speaker where you can clearly hear the tweeter is not making any sound. 4) Would B&W help at all, considering these are older speakers and the fact that I purchased used? 5) Any advice? It's frustrating, because I can tell from what I've heard that these speakers were everything I was hoping for. Less one working tweeter. Thanks....
nyev

I recently did something stupid (which will remain unmentioned) and lost all sound from a 702 S2 tweeter.  I took a chance and ordered a new tweeter not wanting to have to go through the hassle of taking it in for repairs and hoping/gambling that it wasn’t a crossover issue.  I ordered a replacement tweeter from a store on eBay as the B&W online store was showing not available.  It turned out to be a good news story as the tweeter showed up in a few days, the replacement was relatively easy (after watching a few really good B&W tweeter replacement videos on YouTube), and my speakers are as good as new.   

The tweeters in the D series B&Ws are prone to failure and there will not necessarily be any sign of damage.

Getting spares from B&W is becoming problematic but, with persistence, they usually materialise in the end.

@larry5729 , on Monday (tomorrow) when they are back in the shop, they will check to see if they have a D2 series tweeter that they can send to me.  Otherwise, they will have to order one for me from B&W.  We'll see how it turns out. But yeah considering the comments, I think it might be worth picking up a couple spare tweeters myself, despite the very high cost.  At least I have a working pair of 802's. 

My problem is I have a local buyer interested in my old 803's, which now are down one tweeter as that tweeter is now tweeting happily in my 802's.  I need to decide whether to move the tweeter back to my 803's to facilitate the immediate sale, an potentially be without any speakers for many months while I'm waiting for a new tweeter to arrive from B&W.  As I'm typing this, I don't think I will do that; I want my new speakers to be functional...

I am hoping the shop will have a spare tweeter, in perfect working condition, that they can send to me.