tldr.. have to service at their service center only can get this warranty ?

To be eligible for the warranty, cars must be serviced at an official Proton service centre throughout the duration. I also found out that from now, cars brought in to Proton SCs for regular service will also undergo some “power window servicing” which involves silicone spray to reduce friction, among other measures. Previously optional, there’s no extra charge for this, and is part of Proton’s efforts to improve itself.
Applicable to both private and fleet owners, PWLW covers four main components in the power window mechanism, namely the PW regulator, PW motor, PW switches and PW run channel. If your case complies with the T&Cs, Proton will absorb all labour and parts costs. There’s no limit on how many claims can be made per car.