If you have any concern with the laptop and it is still under warranty I would strongly suggest buying AppleCare for your machine to take the warranty out to 3 total years. I have not seen any indicators inside the computer you have. If your computer is running normally now, you should have no problems. Now if you spill a liquid in it that is of an acid content you are out of luck as it will eat at the board. I recently cleaned out a MacBook that had milk spilled in it and would not run. I sprayed down the board with "GC Electronics" Big Bath ISO contact cleaner and it has been working without issue for 5 months now.