Bicycle Mechanics - What are the signs/symptoms of Veloce shifter springs weakening and/or failure?

I would like to know what the symptoms are for failure/weakening of the various springs in the right hand 2006 Veloce shifter. I took the Branford Bike advice based on mileage the last time and ordered and replaced all of the springs a couple of years ago. That was quite expensive and probably some of the replacements were not necessary. What are the warning signs/symptoms that I should look for in the G springs, the thumb button return spring, the coil spring, and the lever return spring? Thank you - Don

I would like to know what the symptoms are for failure/weakening of the various springs in the right hand 2006 Veloce shifter. I took the Branford Bike advice based on mileage the last time and ordered and replaced all of the springs a couple of years ago. That was quite expensive and probably some of the replacements were not necessary. What are the warning signs/symptoms that I should look for in the G springs, the thumb button return spring, the coil spring, and the lever return spring? Thank you - Don

With worn G-springs the indexing detents become a lot less noticeable. You can think you've shifted to a bigger cog and end up back where you started because you didn't shift quite far enough. Eventually you get spontaneous down-shifts. Those don't feel good if you're standing on the pedals.

Right side thumb springs get noticeably weaker. Eventually you have problems with the lever returning all the way if the brake hood is rubbing on it and are unable to shift to larger cogs until you move the lever up with your thumb.

The clock spring just reduces shift effort in one direction. First generation ergo levers made in 1997 and before didn't have one. I haven't a clue if they wear out (there's a stress threshold below which metal can be bent an arbitrary number of times without taking a permanent set with properly designed spring loaded parts avoiding that threshold).

The front lever return springs don't seem to wear appreciably.

The left lever springs don't seem to wear out.

I replace the right side G-springs in my 1996 Chorus levers every couple years and the thumb lever springs perhaps every other time, but have yet to do anything to the left shifter, right front lever return spring, and right front lever ratchet. I haven't touched the right index gear since converting to 9 speeds around 2000. I've also cracked a couple of right side G-spring carriers.

You really only need to replace the g-springs on a "routine" basis. All others on need. The carrier is the second item that will wear out, which is a little bit less often than springs.