Bought my PS5 on 7 August 2022 and my PS5 controller "finally" right analogue stick having intermittent "drifting" issue. Luckily it's still under warranty and I sent it for warranty claim yesterday (Sunday).
Here's how I get it sent for warranty claim:
1. Bring along your receipt of purchase + controller (mine is the controller that comes with the PS5 HFW unit).
2. I went to BBCC LaLaPort Sony Centre for warranty claim.
Note:
Sony Centre opens at 10AM but it's service centre available at 11AM. If you just want to send in for service/warranty claim, do go there at 11AM onwards.
3. Describe the reason/symptom to the attending staff (just like seeing the doctor).
4. You'll be asked to write your name, handphone no., and email address
5. The staff will print a copy of Reservation Job Sheet for you.
6. I was told it'll be 7 working days (but if you wish to check on the status, you can just call the contact by stating your service no. as all the needed info is on the Reservation Job Sheet)
Staff were friendly and helpful. Everything done around 10 minutes.

Just sharing my experience and hope this info helps.