The key point is that Microsoft’s current official Surface service-provider list does not list the Philippines as a country with an Authorized Service Provider or Microsoft in-person Surface service center. Microsoft’s current list covers countries such as Australia, China, Japan, Korea, Singapore, Taiwan, the UK, and the US, but not the Philippines.
Because the laptop suffered a physical impact and contains important, unbacked-up work, I would not let a general laptop repair shop open it, replace the motherboard, reset Windows, or reinstall the OS yet. The immediate priority should be data preservation
Contact Microsoft Support and explain the situation exactly as described.
If Microsoft cannot provide a Philippines-based service route, ask specifically whether they can arrange cross-border service through a supported country.