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Could actually be both. Squirt a small amount of lubricant between the two paddles and shift one or the other multiple times to see if they free up. If not you made to take it to your local shop where the can disassemble the shifter to see if debris has lodged itself inside.
all the contacts for the flight deck are right there in the brake handles.. take the flight deck controls loose and give everything a good cleaning and double check your cabling to the deck...
You may just have dirty contacts or a broken wire... otherwise...things may be wearing out in the shifters..
There is no spring. I just rubbed the contacts with a small pencil eraser. Then I bent the ribbon just a bit upward to give the contacts more pressure.
It sounds like you could have two different problems. Your derailleur has become contaminated or your shifter may need to be lubed. Either way, the likely solution is the same. The best solution to get the derailleur operating again is to spray it with GT-85 or PB blaster and manually move in back and furth until it is working again. The same goes for the 105 shifter, spray GT-85 inside the shifter by compressing the brake lever and spraying towards the head of the shift cable. This will solve a non-functioning shifter many times.
The only other problem that fits is the limit screws could be wrong or the deraileur is in the wrong position. This would not be the case unless someone adjusted your derailleur before the ride you started have that problem. Or if the derailleur has moved. Both of which require the derailleur to be fully readjusted.
You may have broken your derailleur cable. Your cable securing bolt on your front derailleur might have worked loose just enough for the cable to get some slack in it so that your derailleur isn't moving. Try completely loosening the cable bolt at your front derailleur. Pull on the cable and click the control to downshift to the inside crank gear . That should remove all the slack from the cable. Worse case scenario is when you pull on the cable it will completely pull out and it has broken at the shifter. You will have to replace it with a new one. If it isn't broken and you can still shift with the cable make sure your limit screw is properly adjusted for the inside crank ring and then pull all the slack out of the cable with the shifter shifted to that gear. Tighten the bolt that holds the cable in place and try the shifter again. It should now shift normally. If it doesn't you will have to take the bike in to have the shifter repaired. These shifters are not easy to repair unless you have the tools, parts and experience. Hope this helps.
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