Hi and welcome to FixYa,
The power outage is significant. It is most likely that the electronic controller circuitry was affected. This would be part # 38 in this
exploded parts diagram. To check and confirm, a DVM/VOM would be required to test the output/relays of the electronic board. Additionally, this calls for testing the aforementioned PCB (
printed circuit board) live and therefore voltages on wiring and terminals openly exposed. Repairs would then involve familiarity working with electronic/electrical components and circuitry, use of a DVM/VOM and safe handling of the internals of a live appliance.
Incidentally, the filter is common to both water and ice dispensers. Hence if ice is available, then the filter would presumably be good.
Good luck and thank you for using FixYa.