Water damage to MacBook Pro 15 (A1286)

Hi, I am looking to repair a Macbook 15 (A1286), which had water damage. The issue is with display. The computer boots up, but the screen displays as a series of vertical lines. It will display fairly normally when connected to an external monitor. Apple tested the machine, said that the logic board was ok (but wouldn't guarantee that it would stay that way i.e.. may slowly corrode over time). What parts would I need to make this machine operational again? Cheers Jennine