I have a left Shimano 105 5800 shifter that won't shift. I've opened it up a little and it looks as though the ratchet (might not be the correct term for this) no longer returns. It should be spring loaded, so my thoughts are that the spring has broken, but I can't see any obvious evidence of a broken spring. I have Googled this to try and get a view of what this "should" look like but haven't had any luck. I've added some photos of the part that should spring back but doesn't.
Anyone had this problem before and solved it?