I have a Harmon/Kardon AVR 125 have been using it for about 2 years now , works great, I recently moved and went to set up my surround sound in the new place, DTS will work but Dolby digital will not , nothing comes out on the receiver for Dolby digital. But if I switch it to analog or DTS it works fine. Does it sound like the receiver needs to be taken in for repair?