I have a brand new Ryobi cordless hammer drill, that has a defective switch. Who performs service or provides spare parts for Ryobi in the Philippines?

Hi,
I believe that would be Tamsons Enterprises which can be reached at (632) 242-1111 which should give access to all departments. Their address is in Manila and the power tools webpage is at:
Products (http://www.tamsons.com.ph/products/builders_category/powertools.html)
Peace,
Clarke