I'm not sure. It depends on various factors like the source and the author's intention. Sometimes stories are inspired by real events but have fictional elements added.
I have no definite answer. It could potentially draw elements from real life, or it could be completely made up. Maybe you could check reliable sources or reviews to find out more.
One challenge is having the right materials. For example, if mending a clothesline, you need the same type of rope or wire. Another is the skill. If it's a complex line like an electrical one, you need trained technicians. Also, time can be a challenge. If it's a fence line that needs mending to keep animals in, you can't take too long.
Another possibility is that 'Mending the Line' could be about mending a power line or some other type of utility line. For example, a group of linemen during a storm have to quickly mend a downed power line to restore electricity to a small town. This would involve their skills, the challenges they face in harsh weather conditions, and their determination to get the job done.