Coolant Leak - - towards transmission

Hello -

First post! I have a '98 Limited which I recently put up for sale. It has never leaked anything. A guy came and looked it over thoroughly, which included quite a bit of time underneath. I put the truck back in my garage post-inspection and the next morning I discovered all of the coolant had leaked onto the floor. The leak appears to be coming from one, or both metal lines located to the right of the exhaust and just behind the first frame cross member.

I assume that these are coolant lines for the rear heater? They are heavily rusted. I imagine the individual that was underneath disturbed them and hence the leak. Does this sound correct? I can fill the radiator with water and watch it slowly drip from the lines and I cannot located anything else wet anywhere.



Microsoft Onedrive Video Link:

https://1drv.ms/v/s!AhhiELlrgcO2gck_yePJtmxS1wckhA?e=exTMJT