Can't answer the questions about servicing as ours is slightly different this end of the world. But be wary if it's flashing codes. Can often be quite expensive to replace parts, if required. If it wasn't the Hoon event weekend, you might find someone nearby that knows their 350's that might be able to look over it with you.
Oh, and by the way, the colour of the car is "Sunset". The dealer is wrong. Also known as Le Mans Sunset in most other countries including the US.