Or that includes navigation / propulsion / course corrections / reorientation also?
(There is not enough "solar power" that can be harvested at that distance I presume)
If we spread out the communications to be less frequent and say bring it down to essentially a heartbeat signal once a month ..would it prolong the service life. Mostly for emotional reasons at that point :)
Simply turn the heaters off before transmitting and keep any transmission periods short enough that the electronics don't get too cold.
JPL probably have a bunch of tricks like this ready for when power levels drop. That 2025 estimate is 10 years old and I'd be surprised if it's final.