hi guys Before stripping out my knackerd cd/headunit and sorting out a new part (main dealer wants £1100 quid to diagnose fit and code) is there a way to find out what unit or part number was used on production line so as I could try for a second hand unit, if i can find this out it will help me no end as I wount then need to strip out the old unit until I get a replacement if that makes sence

TIA
Mark.