If you don't have and can't get a zip of the original source code the channel was built with, you'll need to rebuild it from the ground up.
Assuming the channel includes firmware components, it probably needs to be rebuilt within a year to keep working in the RSG-only future we've been told is coming Jan 1, 2019.
Depending on your timeline and the complexity of your channel, along with your ability to pick up new languages and tolerance for bugs and setbacks, doing it yourself may or may not be feasible.
aspiring