Thanks for the reply.
I'm pretty sure that it is throttle cable driven. I left the boat at the lake 4 hours away, and will need to take a closer look next time that I am there. I talked with PP today, and the very helpful gentleman seemed surprised that this particular year and model of boat only had the basic cruise, and then talked about it as if he assumed there was a cable involved. The upgrade is $654 plus shipping. Assuming that it is throttle and servo, do you know of anything quick that I could try to fix it?