TAS5414A set Hi-Z mode

Hi,

I drive TAS5414A by microprocessor via I2C.
After start all outputs are in a Hi-Z mode.

 The load diagnostic function can only be invoked when the output
is in the Hi-Z mode. If the amplifier is already in play mode, it must
Mute and then Hi-Z before the load diagnostic can be performed.

When I set play mode the amplifier is moved out of Hi-Z mode.

How do I go  back to HI-Z mode via I2C for load diagnostic ? What is the registry?  What is the value ?

Thank you

Peter