Help - Panasonic DVD-F85

My Panasonic DVD-F85 I purchased will not play DTS. It plays Dobly Digital all right. I have switched back and forth from bitstream and PCM in the audio menu. Have tried everything I can think of. I have a Yamaha RX-V1400 reciever. I press the input select on the DVD button on the reciever remote and all it will select is PCM. The DVD will not output a DTS signal. Any ideas. I purchased the player on line a little over a month age. Not sure if they will take it back now.

Well after playing with it for a couple of hours I got it to work. Switched DTS on audio menu to bitstream and pressed the audio button a few times on remote and it started to work. Manual is about useless. Way to much work to get this thing to work.