"Toys 'R' Us does say in its SEC filings that $47 million in transaction fees that it owed KKR, Bain and Vornado, have been waived. The advisory fees were also voluntarily reduced by the investment firms in recent years" [1].
(Toys 'R' Us did pay the PE consortium "$470 million in fees and interest" [2], but the vast bulk of that goes to the fund, i.e. the people who just lost a billion dollars.)
[1] https://www.forbes.com/sites/nathanvardi/2017/09/19/the-big-...
[2] https://www.bloomberg.com/news/articles/2017-09-19/bain-kkr-...