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Technical FAQ: Rebuilding Dura-Ace shifters

Dear Lennard,
Are Dura-Ace ST-7700 shifters able to be rebuilt? My rear shifter has difficulty up-shifting. It takes sometimes as many as 10 shifts to move one gear. As per Shimano’s advice, I removed the shifter, soaked it in degreaser for three hours, air dried, and lubed the insides with TriFlow by inserting a tube into the shifter. It still doesn’t work.
-Aaron

Dear Aaron,
No, they cannot be rebuilt.
-Lennard