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Yamaha RX-V500 Tuner Freq commands not working

I have a Yamaha RX-V500 tuner that I have setup to control via IP. It is working for 99 % of functions and has been for months however I am having trouble getting any of the tuner frequency change codes to work with the unit. I am able to change from AM / FM / Net radio etc but not change the freq up via manual, auto search or preset search. I have got the codes directly from Yamaha as per screenshot attached. I have added the \x0D\x0A suffix as per the other codes for the device which are working.. Ie - @MAIN:INP=TUNER\x0D\x0A

Can someone give me some advice on why this would not be working for these codes?

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