I read this article and there is this sentece: This new color mutation’s unique characteristics are created by the production of red pigments which change the yellows to pinks and greens to browns. The forehead of 'our' parrot is lighter than red on the wings, so I think there is yellow in a natural colour. The yellow crowned amazon has got a dark beak, in the photo it is pale (this mutation doesn't change dark) so in my opinon it may be DYH.I've seen pictures of a similar red colour mutation of a blue front
Red Color Mutation of the Blue-fronted Amazon | Voren's Aviaries Inc