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I had that problem too with the right Shimano 105 8-speed Brifter (shifting/braking levers).
My solution? I unmounted the lever, just enough to have acess to all parts, and cleaned it with a small brush, WD40 and compressed air. Then, make it work up and down several times, so it releases the dirt/ old grease.
Lube it, and mount it again.
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No other marks except the colnago decals. The material looks/feels thiner than aluminium, maybe scandium(?).
The main triangle is just like this one http://www.ebay.com/itm/Cunningham-Cycles-Scandium-Carbon-Road-Bike-/161265876857?pt=US_Bicycles_Frames&hash=item258c31ff79