hello,Is it ok, if there is SINGLE CH caution during approach? even close to runway it changes to LAND 3. should be it like this, or something is wrong? I was doing everything according to manual.

Yes, that is correct.It is not a caution but the AFDS status.It will announce Single Channel (after capturing the localizer in APP mode) untill below 1500 ft.It then changes to Land 3 provided you have engaged both autopilots. ( before 800 ft )Fred.

Thank you.And do you know, what function has "CABIN LIGHTS" in "FS ACTIONS" mode on the CDU? I did not notice any change, when I turn it to AUTO, or MANUAL mode.

If you select manual choose one of the options. FULL, %75, %50 etc. Then look outside of the aircraft at night. If you selected FULL %100 then when looking at the aircraft from the outside view the lights shining through the windows will be very bright.

Thank you.And do you know, what function has "CABIN LIGHTS" in "FS ACTIONS" mode on the CDU? I did not notice any change, when I turn it to AUTO, or MANUAL mode.

It is explained in the intro manual ..........page 103.It is about the cabin lighting when viewed from outside the plane !!Fred.