repairs

My 4x4 light flashes green in my 2008 ML Triton GLXR, when I turn the ignition on but not the engine, and after I start the engine the light keeps flashing. I Haven’t put in 4h or 4l since the issue started happening, so the it’s only been in 2h. Are there any common issues related to this that...

Have a ‘01 105 series cruiser with a rust problem in the roof. There’s a patch of rust that is about 7x2cm with a hole that’s about 1cm large (photo attached). I’ve heard a mechanic/ panel beater can write the vehicle off if the rust is bad. Just wondering if it’s there’s any chance of it being...