Replacement part for an Onkyo TX-DS575X receiver

I'm looking for a replacement part for an Onkyo TX-DS575X receiver. The onkyo part number is 22240864 which is a Toshiba TC9273N-004 analog switch IC. This may be a custon version of the TC9273N. The data sheet says nothing about the ending sufix, just that the chip can be custom masked. If anyone knows of a source for this part, please let me know. MCM Electronics had the TC9273N listed but the part they sent me was a TC9273N-009 which doesn't seem to work. Thanks for your time.

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