My old Sony A/V receiver died, so I picked up a Sony STR-DH500 receiver today. None of the codes shown for Sony on my DirecTV R10 seem to work with this new receiver. I've done some searching on the forums, but can't seem to find anything for this specific receiver. I've seen some posts mentioning AV1 vs AV2 controls on the receiver, but I'm not really sure what that means or if it might help my situation. Any help would be much appreciated. Thanks.