No definitive gen, but I was in Ireland last weekend using 201 services.
Enterprise services were using 206/207/227/231 last Saturday: there is often a swap-out on one turn at Connolly (between arrival of 0800 from Belfast and departure of the 1120), with the standby loco going onto the set and the loco coming off the set going to Inchicore for maintenance. 8209 came over from Inchicore to take up the standby role.
Out of Heuston on Sunday I saw 215/219/226/228 (yes, Enterprise loco on Corks)/229. 220 and 225 are reportedly at Inchicore on, or due, overhaul.
Not sure if that helps or not...