[Dave at Pelican Parts]

Nope, not really. The fluid change is regular maintenance, while seal changes are done on an as-needed basis. They do sometimes drive the transmission fluid change schedule, though! If you have a leaking shift selector shaft bushing, or a leaking speedo angle drive, you might want to change them after you drain the fluid out. (Because removing those typically dumps some or all of the fluid anyway. And makes a big mess!)

--DD