Back then (late 50's) people complained about the cherry color (wow) fading too fast in sunlight to the lemon color underneath (eewww). Today, Gibson uses a formulation that prevents too much fading of the cherry (eeeww) so it doesn't fade into the lemon color (wowww) underneath.
Tama si rowley. If you're gonna leave it in sunlight, cover everything that you do not intend to fade. Sunlight can also be harsh on your plastics.
I haven't heard or read about a Gibson USA being sent to HM for a make over.