Nelly has posted a word document with the full list for 749/999
As I recall, when the amber light is, turn off the ignition, hold down both buttons and turn ignition on. (you may need a helper with this
)
The error code appears as EFI 2.1 or some such.
Although how much use this is is questionable. When I had EFI 2.1 it was good to know that at least I knew what the description was, but nobody knows which sensor it was referring to - and as I am told by the dealer, not even DUK!