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Hi, difficult one i'm afraid.....if its the front screen it really is best to contact your local Xperia Care about it & if they do repair it at least your warranty for any other problems that may arise in your phone are covered, tho i am not sure if your cracked screen will be covered by warranty as a lot of people have found out 
Both screens can be repaired by a 3rd party repairer but this will void your warranty i'm afraid but be careful to get a guarantee from them incase they damage anything else in doing the repair.
Hope this helps & good luck :smileysmileywink:
Hi elenim,
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