My father had liver transplant, enzymes are increasing highly?

My father had liver transplantation on 1362016 and he had a billary support in billary tract on 1892016 due to stenosis now his alt and ast are normal but alkph=769 , GGT=408 these two enzymes are increasing highly and some times pale stool he takes prograph 6 mgday , certican 1.5two times day
please any doctor or who has experience can help me with this situation ?

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