I also had an interesting experience where my K5xe had been upgraded to an MP but they didn't place the "new" identifying sticker on the unit. I didn't know until I tried to sell it and was asked about why the sticker was missing if it was indeed an MP.
I called Ayre to try and rectify it...at least get them to send a message in writing proving this serial number was indeed an MP but they took over a month to call me back (after multiple attempts of calling them) and then refused to help at all. They wouldn't even help prove to me, the current owner, that the change was made...end result...I took a hit on the sale cause I couldn't prove it was upgraded...this was about 3 years ago.
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Jayson  Analog: Garrard 301 (Hammertone) | Woodsong Audio Plinth | Schick | Ortofon SPU 90th| A23 SUT (SPU)
Everything Else: Devialet D-Premier | KEF LS50 | Sennheiser HD700 | GEEK Out / Pulse X
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