Question When I press the right cursor and stereo select buttons at power-up, I see the confirmation dialog box but it doesn't seem to run the diagnostics. What's going on

The 02R diagnostics was removed from the EPROM's to get enough space for the Finalizer D.C algorithm. This decision was made by both Yamaha and TC. Running version 2.1x TC and Pressing '->' (cursor right) and Stereo-SEL while powering on, allows you to cancel or execute 'Diagnostics'. Except, it won't actually work. You will have to install original EPROM's to get the diagnostics back.