Yes, Eileen had the right idea.

By the way, with
earlier models (up to Tyros4) a sub-out routing is only active if plugs were actually connected to the relevant sub-out jacks. I.e. if nothing is connected to the sub-outs, all parts are automatically output via the
main-outs again.)
As of Tyros5, Yamaha changed this behavior for reasons unknown to me, i.e. even if
nothing is connected to the sub-out jacks, parts routed there are removed from the main mix.
Since the sub-out routing can be changed by
registrations, I recommend creating at least one
setup registration with the standard line-out routing (all parts to the main outs) and having it ready so that the standard routing can be restored quickly if necessary.
Best regards,
Chris