I don't know what's up with the differences you see in your diagrams compared to the machine you have, perhaps something to do with an Australian version? I don't know if there's a difference with a North America and an Aussie version myself. As for serial number, the North American JLG boom lifts start with 03000, then the s/n, like 0300021445, maybe they do it different for the machine down under. Aside from that, sounds like you've go some testing to do. All functions work from lower controls. Swing, boom lift, tower lift, and drive does not work from upper controls, boom telescope and steer does work from upper controls. I take it swing, boom lift, tower lift, and drive are all proportional controls? If yes, are these controlled by PQ controllers?
BTW, again, I can't verify on an Aussie version, but on JLG machines of that vintage, as far as the N America machines are concerned, JLG stamped the s/n in the lower frame. I can't recall for sure where they stamped it on the 45HA, and sometimes after a machine has had a few freshen up paint jobs it hides this stamped number. Just saying look the lower machine frame over real good for a stamped number.