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MANtraveller I've literally just copied the routing given by rossmacd in the post you have quoted and it did price up on matrix.
A couple of pointers:
Remember to also add LAX as the start point in 'Departing from' and PTY in 'Destination'
Remember to add maxconnect 1000 into the extension code
Then select business as cabin.
I also selected specific dates and then =/-2 days
This brought up various options which you can then explore in more detail.
Good luck