STI shifter overhaul
All
Hopped on the bike this AM and could not get the front shifter to work, either up or down. It's a ST-6603, Ultegra triple shifter. It has worked fine for 3 yrs, I commute on the bike in Seattle so it's get pretty wet and likely dirty. Was working perfectly 3 wks ago right before the holidays. I monkeyed around for 20 min trying to get it to work, no dice. Took it off the bike and of course now it seems to be shifting OK. My guess is that there is dirt or hardened grease in there. So my question is, is a cleaning/lube something that I could tackle, my LBS (which opens in 2 hrs) might tackle, or are these units basically disposable? I couldn't find any diagrams or instructions in a brief search, but if anyone has some useful documentation I would be grateful.
TIA