According to the IRS’ Section 8A - Master File Codes, transaction code (TC) 826 indicates that a “debit for the amount of overpayment credit transferred to another tax module within this taxpayer’s account. The corresponding credit is 706.”
You should see the amount of the transfer next to TC 826, and you should be able to identify what tax year the amount was transferred to next to TC 706, if you see that.
@letitiadavis986
