Greetings Ron and Lisa,
I’ve been on the road all week and this slipped through the cracks.
I apologize but you are getting bad information from well-intentioned people.
JoJo could not have been exposed to zinc poisoning from the paint on his cage.
That’s an impossibility.
Bird cages are no longer painted.
Painting bird cages is wasteful and inefficient.
The practice was stopped around the turn of the 21st century with the last known company painting small cages here in Chicago, Prevue Pet.
Bird cages are powder coated.
Powder coating individual pieces are hung on a rack in a long line that moves forward either mechanically or by a factory person dragging each part which is on a hook connected to a roller system above.
A fine coat of powder is dispensed from a unit that puts a positive electrical charge on each particle which is usually ground to about 1000th of an inch.
The powder adheres to the metal substrate and then the park is rolled into a large oven at around 800° where the powder literally binds with the metal.
Bird cages in general do not have zinc in the metal otherwise you would be reading about birds getting poisoned seven days a week.
Prevue Pet here in Chicago has been making bird cages literally since 1869.
They sell to all the big-box stores including Amazon.
They cannot take the chance of a single pet bird being injured because of their fiduciary liability obligations.
I know about powder coating more than most people having managed a powder coating factory in the late 90’s.
Chances are whatever poisoned your bird still might be in the cage like a washer or a toy part which is always a more likely culprit to contain zinc.
As for the diagnosis of Bird Fanciers Disease – that’s absolute nonsense and I’ll be more than happy to have a conversation with the pulmonologist.
People who have dozens (or hundreds) of racing pigeons get Bird Fanciers Disease.
Breeders with large operating aviaries get Bird Fanciers Disease.
Not people with an individual cockatoo.
I don’t know what your financial situation is but if you could afford about $500 I would advocate enlisting the services of a company like Indoor Science.