The Irish Financial Services Regulatory Authority is due to publish its second report into the overcharging scandal at AIB later today.
Earlier this year, the authority reported the bank overcharged customers by €34.2m for a range of services.
Today's report is expected to focus on the actions the bank's officials took when they learned of the overcharging.
And reports this morning said the IFSRA investigation would also investigate allegations AIB executives had covered up overcharging on foreign exchange transactions.