Doug B. wrote:
Just want to verify the common wisdom:
If the WD-40 treatment doesn't fix shifter problems, replace the
shifter?

Left Ultegra ST-6501 front lever moves when rear lever is pushed,
preventing downshift. Appears the spring for the front lever has
weakened. When front lever is held stationary, rear lever works as
expected.

Thanks.
Doug B.

Common failure mode of 9s STI, both ultegra and DA...replace..may want
to look at Campag, and no more busted, throw away lever problems.