Gave a call to apple support and talked to an advisor since I am using Airpods Pro with an Android phone and wanted to check its manufacturing date, to see if I can replace the airpods.
The advisor asked for the airpods firmware, serial number and whether it was purchased from an apple store. I told her it was from a credit card promo Singsaver.
After a while, she said it's eligible for repair and set me up for an appointment in Jewel airport apple store.
Headed down there and the staff just asked what's the problem with it briefly. He took the airpods without the case and tested it in the backroom.
Both sides got problem and was replaced. The staff also told me this free replacement is only available within 2 years of the airpods purchase date and whether it's manufactured before Oct 2020.
Also, there's a 90 day warranty for the replaced airpods if there are still issues.
Kudos