One that might fit that requirement is a decision to alter the term of renewal for the account. For example, if the current account has a provision that it will automatically be renewed for a like term, and the bank doesn't want any more 13 month CD and decides the renewal of current 13-month accounts will be for 18 months, that could be said to impact the current accounts before renewal.
Or if the CD is a floating rate account with a published index that ceases to exist, the bank will need to substitute another index. That would fit the "before maturity" scenario.
_________________________
John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8