What happened the organism?

Answer 1

The failed organ from the recipient will usually be removed (except in the case of "normal" kidney transplants, where the recipients original kidneys are kept in place and a transplanted kidney is added).

Once the organ is removed, if consent from the patient has been given for their organ to be used in research, their failed organ will be taken to the lab (normally in the same hospital as the transplant operation). This is where it will be analysed to double-check the cause of it's failure (cause of failure is normally established far in advance of a transplant operation, but it should be verified). Any unusual patches will be noted/photographed and studied if necessary (if it's an interesting specimen). If it is a particularly interesting specimen it may be preserved, either whole or on slides, or as a computerized 3D image. Once the organ has served it's purpose in the lab, it will be incinerated as medical waste.

If the patient did not give consent for their organ to be used in medical research, their failed organ will simply be incinerated as medical waste.