I assume we're talking about TV/0060
The up, down, left and right commands in TV/0060 are duplicate of the CH and VOL keys (EFC number 119, 117, 059 and 186). Those match the EFC numbers on Rob's site.
Many TV's reuse CH and VOL as menu navigation, but this Akai apparently doesn't.
In the Akai PDP-4294 upgrade here
[Link: groups.yahoo.com]The up, down, left and right keys are EFC numbers 197, 201, 200 and 199, even though the CH and VOL keys match TV/0060. So those seem to be your best bet. (I can't find those listed on Rob's page for TV/0060).