Well, the yellow colour feathers of ur eclectus parrot is mainly due to over handling, I think u r always catching it and keeping it in hand or someone in ur home doing like that, when human sweat or oil products fall on birds frequently, it leads to bacterial and fungal infection,
The other reason may be improper nutrition,
Sometimes also due to mites....
Next Steps
kindly explain me about ur parrot more and send pictures to me and explain in detail about ur parrot feeding, life style etc, so that I can help u...
Health Tips
don't overhandle ur parrot