ISB7005 Receiver No Audio

I'm staying at an AirBNB for a month, and their downstairs TV has no audio. I've restarted the receiver, tested other HDMI devices to ensure the TV audio itself isn't broken, and also made sure the TV audio wasn't muted. The TV audio works fine with other devices. From what I've read online the receiver itself is likely muted, but the remote is programmed to the TV. How do I program the remote to the receiver? I have an S30 remote, and there is no ATT button on it. 

I ran through the audio troubleshooter, but it asks for the owners pin number, which I do not have access to. Thanks for the help and happy holidays!