I entered my computer's serial number, but it's unclear if it is affected or not: > The serial number you entered is not eligible under this program because either: > • It's not in the affected serial number range. > • Our records show that your battery has already been replaced. > • Our records show it's no longer eligible for a free replacement under this program. > If you have questions, please contact Apple. If e…
If that’s not enough, you could try Apple support. They have many options short of Genius bar. Email, chat, phone, and the Support app. Maybe one of those will help.