Problems with Erratum E2-9 (base64Binary)

I was rereading erratum E2-9 and noticed a few errors in the
productions:

1. The Base64Binary production refers to Base64final, which should
really be B64final. 

2. The B64line production is missing one B64x15 (There are only 61
rather than 76 B4's).

3. B64x4, used in the B64lastline production, is never defined.

4. The B64lastline production has an extra right parenthesis.

Thanks,
Priscilla