I haven't been using my bike that much lately, and last time out both shifters were playing up- the levers wouldn't return after shifting and I had to push them back into the ready position every time.
So my question is- is it worth opening up the shifters and poking about, or are there 100 tiny parts/springs that will jump out as soon as I do and make me wish I'd just got new ones? They're LX shifters and have worked fine for nearly 4 years now.

