Join Date: Oct 2004
Location: Portland Oregon
Bikes: Litespeed Arenberg, Litespeed Atlas, Fuji Track, Trek Fuel 90, Felt S32 TT bike, Bianchi Axis '05, and a lot of older bikes...
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I haven't heard of a re-build service. Several people I know in Portland claim that 105 is more resistant to grit and the elements in general than Ulltegra or Dura Ace.
You've probably already tried re-cabling with new housings- but if not, try that before chucking the levers. If all else fails, you can flush the lever assembly with teflon chain lube to wash out the contaminents. Once you start putting lubricants in your levers, you have to keep doing it. It will start collecting debris more easily and require flushing more often.
Hopefully cables and housing will clear it for you.
One last thing- make sure your chain and cogs aren't really worn. Worn chains shift late when the shift at all.