Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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I'd get in touch with the manufacturer/importer. I don't think you can get a mandrel into the top tube to "iron out" the dent which would be the simplest repair method.
Most frame builders can't repair an Al frame and the repair would be very expensive if you find one that will. Repairs would require cutting out the old tube, welding in a new one, heat treating the frame (that's the most difficult part) and repainting.
The "factory" is your best bet. Some brands have a crash-replacement policy where they will sell you a new frame at lower cost. I believe Cannondale is one but there are others.