I lost one young peachick to ascites last year, he also had a heart defect, so no surgery would have saved him. FYI, someone in the peafowl forum was quoted something like $1500 to spay her peahen that had EYP due to a *stuck* egg and was told there was a good chance the hen wouldn't survive the...
I don't want to give anyone false hope, because this case was the exception, not the norm. Someone recently posted that they took their hen to the vet, started on Baytril and steroids and several days later the hen passed a nasty, necrotic looking egg. My experiences have all ended the same way...