Last ditch effort, find some amoxicillin and orally syringe food and antibiotic. Use a prepared baby bird formula. I get antibiotics from tropical fish store. Remove any other foods. Confine to crate to monitor stools. Heat to compensate if bird is not eating. Their normal body temp is...
If it is a prolapse, definitely get some blood work done for disease. Treat it with softer foods, perhaps best to soak food in water to increase liquid intake if stools are difficult to pass, straining. More greens in diet
If overheated, feathers will be held tight against body and wings slightly extended out
I agree about grit not being used at this time. Does it contain carbon, black charcoal.
Avian vet will NOT show me how to release air and says it is only cosmetic and does not harm the bird. He made an inscission in the back office and does not want me to learn because I cannot produce a sterile environment to do it myself. He ran tests and will not share normal values with me...