TjLaZer tipped us off:
Ever notice like on A4000's that certain parts of it will yellow more than others? I also have a C=1902 that is fine but the door is yellowed! On my A4000 all is fine except for the plate under the floppy! Some plastics yellow more than others.
;-) Either that, or the parts in question have been swapped from other Amigas, with a different degree of yellowing.
