Hoping for some help please. We purchased a house with an older existing home theater set up. The problem is that the volume is clearly louder on the Left. This is true in all rooms and across all sources. I checked the Balance settings in the rooms and they are fine. The original installers no longer service Crestron but they thought that the amp (the AADS) may have gone bad on one channel. Is there a master balance control or is this likely a bad component?