Bought a '92 30' and got an earlier manual with it.
Just to cheer you up: we just bought a 1990 30'. We have the "right" manual.
Aren't we lucky????
We are still looking for a single page where book & trailer agree 100%.
Your best bet is do like we do: to save time, make believe you don't have a manual. Saves a lot of agravations.
I don't know if we are supposed to have one or not. Under the key hole (low part of handle), we have something that looks like a gob of chewing gum (must hide a hole from a bolt).
I suppose that's where our button should be, if we had a button.
Now I must wonder: who needs a door bell with a trailer ?
Isn't that what a good smack with the palm of the hand is for? Try it, that aluminium box is sure loud.