Dell inspiron SE 7520 motherboard

My laptop Dell Inspiron 7520 purchased in Dec 2012 from Dell Exclusive outlet at Bangalore. 3 weeks ago it failed to boot after I updated the intel RST drivers. I have submitted my laptop for repair at authorized Dell outlet at Koramangala Bangalore, where I was told that motherboard is defective and needs to be changed. However the same is not available with the service center. I would like to where can I get spares for my laptop. 

Thank you.