I thought I replied, but I guess it didn't get posted. Anyway...

It turns out that after a thorough cleaning with carb cleaner and watching all the gunk loosen off of the derailleur, it snaps back to the smallest cog with no issues at all. It actually went too far because I'd been tinkering with the limit screws. Now, everything is back to normal.

I'm a tad embarrassed, actually. The derailleur didn't even look that dirty, but I guess inside is what counts. After cleaning it out, I lubed it with Tri-flow and it shifts like new again. I'm really happy that I don't have to replace it.

Thanks a million for the suggestions. Much appreciated to have that kind of support!

-Collin-