Wye-Wye Transformer Bank Reversed Connection)

Had a field connection done wrong the other day and wanted some input on the scenario. I was getting stumped because of the backwards third transformer connection. It was a wye-wye bank. (12470/7200 Primary & 208/120 Secondary)

Transformer # 1: H1=A, H2=N ===> X1=a, X2=n
Transformer # 2: H1=B, H2=N ===> X1=b, X2=n
Transformer # 3: H1=C, H2=N ===> X1=n, X2=c (This is the flipped connection)

The field guy swapped the secondary connections on the third transformer. I was needing some assistance on calculating the phase angle, p-p voltage, and p-g voltage. The third transformer is reversed connection, so I figured 180 degress shift. So, C would be between A & B right? I was thinking 0, -60, -120 derees. Is this correct? How do I calculate the three things mentioned before.