Kidney failure shortly after transplant; not rejection

A friend of ours discovered during a routine examination over 3 years ago that he had kidney disease.  He was the picture of health and didn't drink or smoke or take any drugs.  He is almost 65 now.  None of the doctors in this area could find out why his kidneys were failing.  He was on home dialysis for 3 years, and about a month ago received a kidney transplant and was doing great.  He had a biopsy on the kidney last week, which is routine, and he was notified today that whatever caused his kidneys to fail (nobody knows) is causing this new kidney to fail.  He was told there is some process they will start that is similar to dialysis to try to stop the progression of this kidney failure.  Wouldn't it be prudent to try to find the cause of why his body is ruining kidneys?  Is anyone aware of a case like this?  Any help would be greatly appreciated.  We were told this by his wife today because they just found out today, but he's reluctant to tell anyone, so we can't ask any more questions at this point. We had hoped someone would have had a similar problem and would be able to impart advice.  Thank you.  G. Regan