New to ssrs unable to get correct syntax for IF AND statment.

I have a formula I tested in exel that works but I cannot seem to be able to figure out the correct way to use Iif.

Formula:

=IIF(AND(Fields!Assigned_TO_SVD.Value="PI LAB INFR",Fields!Assigned_TO_SVD.Value<>Fields!Assigning_SVD.Value,Fields!Assigning_SVD.Value<>"PI BIL HST INFR",Fields!Action_Type.Value=1),Fields!Action_Date.Value-Fields!Start_Date.Value,IIF(AND(Fields!Assigned_TO_SVD.Value="PI BILHSTINFR",Fields!Assigned_TO_SVD.Value<>Fields!Assigning_SVD.Value,Fields!Assigning_SVD.Value<>"PI LAB INFR",Fields!Action_Type.Value=1),Fields!Action_Date.Value-Fields!Start_Date.Value,"N/A"))

I know this is not correct but not sure how to write it.

Thanks in advance for any assistance.