As per this forum post and as posted by [NAME] : 90 days or the duration of the existing warranty - whichever is longer. That would appear to mean the warranty has expired since your Premium warranty has expired.
Hello, On Dec 2021 my Alienware 17 R4's premium support has ended and i tried to extend my warrenty but they replied me that they don't support products over 4 years, so i accepted that and carried on and now two weeks back my Aw17r4 is having some issues mainly the powering on issues, it will not power up at all, tried all the tricks and tips. Now what I want to know is that, on  March 2021 my motherboard is replaced under the warranty of premium support, so now my premium has expired, but i think there is a one year warranty of parts replaced by Dell under warranty, so i want to know, if it's possible for me to claim my warranty of the motherboard they replaced during march 2021.  
17 R4, motherboard warranty