How do I fix a Yamaha Digital Keyboard?

To make a long story short I dinged my sister's Yamaha digital keyboard (I think the model is WK13700) on the wall as I was carrying it to another room, and when i went to inspect it, the casing on the left side (towards the lower notes) came off a little and now when you press a key it skips and it's very... show more To make a long story short I dinged my sister's Yamaha digital keyboard (I think the model is WK13700) on the wall as I was carrying it to another room, and when i went to inspect it, the casing on the left side (towards the lower notes) came off a little and now when you press a key it skips and it's very noticeable; I think I might have messed up the wiring. This isn't even her keyboard, she's borrowing it from school, is this fixable or does this have to be fixed professionally?
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