We have the same model in our '72. We will be replacing it with a new Carrier Air V soon. If you lived closer I'd offer it to you to use for parts, but IL is a bit far from Calif. It still works Ok, but in our 31ft AS a newer 15,000 btu will do a better job than the original 12,500 btu. Here is a manual I found on another thread, maybe it's better than the one you are currently using for reference. Hope you can figure it out. The one page was scanned backwards, so you'll have to rotate it to read it (not caused by me)
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Ok, so I just realized this is the manual you already have, but maybe someone new reading this might have use for it.
Mary