Jerrycolemanjc

I'm new to motor homes and I'm trying to winterize mine. I have a Thor ACE 29.4 length. I live in North Texas. A friend who has owned 4 motor homes tried to help me. We drained and bypassed the Atwood water heater but we can't find the low water point drain. We crawled all underneath, looked in every storage compartment, opened all the cabinets down low. No drain. Calling Thor was a waste of time as was the dealer. Any ideas?