that letter should explain the change. your options are to call the IRS at the number listed for further clarification or post info in this forum about what lines were changed. then we may be able to offer a further explanation.
the IRS says that if you haven't gotten answers after contacting IRS several times call the Taxpayer Advocate at 877-777-4778 or for TTY/TDD 800-829-4059. this may not work either since the TAS is also swamped with requests.
