It'd help if you could post a picture of where the scratch is situated in? Since this is a closed loop watercooling unit, I'd advise against opening the unit as this will void your warranty. The previous point however is moot to those who are proficient with watercooling and know what they are doing thus the advice to not tamper with the unit.
The thread title is meant to hold the thread's topic in a clear/concise manner while the thread's body should hold the meat and potatoes of the issue. You've gone about it the wrong way though. Please try and explain the issue with more detail in the body of your thread.
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Lutfij