Hello Naveed,
As you may know authorization objects are assigned to transactions. You can see this assignment using either transactions SU22 or SU24. You can see SE16 transaction's assigned authorization objects.
When you add a transaction to a role the authorisation objects that has "proposal = Yes" are automatically added to the authorisation part of that role.
You can see details of the role using PFCG transaction as you know. Go to authorizations tab and Display Authorization Data. There you will see all authorization objects that were added to the role.
As you see in below picture you can check where used list of an authorization object by pressing the 
icon on the left.
This list gives the transaction list that added this auth object to this role. When you check this transaction in SU22 you will see the same list too.
You can check you roles with this info. And find which transaction bring S_TABU_DIS with 02 and *.
Hope it helps.
Rregards,
Yuksel AKCINAR