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I have two claims right now, one with Dell and one with Lenovo. For the Lenovo monitor, I found a serial code on eBay when I searched "Lenovo Monitor" and sorted by old listings. I was extremely surprised the warranty of the Monitor (that I found on Lenovos Warranty Status Checker using the SN from eBay) still had warranty for two more years, AND had a advanced replacement.

at Lenovo warranty checker by Advanced Replacement you meant Premium Care or Premier Onsite Support?