I wanted to thank everyone who responded to my query. We would never have found the dipstick if not for you... It is no longer "Yellow." As a result, we changed the transmission oil at the instant oil change place for $30, and can now cancel our $90 appointment with the dealer.
As for the truck-transmission-like whine while rolling ... the transmission plug showed only the usual amount of junk on it, nothing shiny, chunky, or fresh. We still have no idea, except that we did establish that the whine doesn't skip a beat when you shift into neutral and coast. Clutch in, clutch out, no difference.
Thanks again.
Turgidson