Vw passat B6 2005 cluster can bus comms

Hi all my first post,
I have a project which may turn into a simulator.
I have this cluster connected to an arduino and Mcp2515 module on the hi speed can line (pins 28 & 29), I have control of all the guages (except fuel which is a pot) and warning lights, and I can send steering wheel button commands, but I’m struggling with clearing the driver assist button error and sending text to the fis display, i’ve tried lots of can id’s and simulating various modules.
Does this cluster just have one can bus or is there a comfort can too (which pins)?, and any info on getting text to work on fis (radio or nav) would be useful thanks.