I have Denon AVR-X1400H. Few days back it have problems with Dolby functions. Volume control is not working. but can control through remote. all the sound modes working except dolby surround and DTS Neural Modes. in those two modes sound comes too low and distorted. I tried to setup speakers once again. no out put comes from center speaker. I am residing near chennai, Tamilnadu. Any one knows a good service center in chennai please guide me.