Hello guys, been a lurker for awhile first time posting, did a search and couldnt find any info. I got a a-bus system that came with my house and when I finally got my power supply 2 of the 4 rooms volume control have no power. The system is 4 years old and I dont think it was used that much, do the volume controls die out? The controls are russound avc2. Any help would be appreciated.