A couple of years ago there was a lot of talk in this forum about a high pitched whine coming from the centre channel of the SR7300 & OSE models. I forgot about this issue when I picked up a used OSE a couple months back. Unfortunately, the unit I have exhibits this problem. Basically, when a signal is sent through the receiver there is a high-frequency whine from all channels, but it is loudest from the centre. The intensity varies depending on the DSP mode and whether Source Direct is engaged. It is loudest when in any surround mode and in digital, and it is least noticable when in analogue stereo in Source Direct. I don't recall a fix ever being discussed. Has anyone ever had their 7300 successfully repaired?