Hopefully the brown isn't hard to get matched.
Does anyone else know of a good match ?

Maybe the colour's  'Mission Brown' or a nice Kiwi Brown shoe polish colour. 
I remember I just got some watercolours and mixed up the right shade for the few little marks on mine.
I hope you get her going soon, it's a really fun game. I recently had my Power supply board rebuilt and now Mav plays perfectly so I hope it fixes yours up too!