So my wife has a 2009 Gx Nav w/ ML audio but she also has a more gas friendly car that she drives more often than the gx. well she finally drove the Gx the other day after about 3 weeks of sitting and we both have noticed that the audio is very quiet compared to what it was before. All the speakers are working, but it seems all the speakers for the second row and the very back are not nearly as loud as they should be. There is still sound coming out of them but almost minimal compared to the front speakers in the car. I ran the diagnostics screen and it says the amp and HU are "OK" it does say "CHECK" by the Dvd tab but im assuming thats because there isn't one in this car. Any ideas? Ive checked all the setting, the audio balance, equalizer. Everything is just how we left it but the speakers just aren't very loud.