If it fixed the leak? Why not? Especially if it enabled them to fix it faster and/or cheaper.
Just FYI, AI is in use in the construction trades already, most people aren't aware of that. For your example a draftsman can feed the plans of a building into an adequately trained system and map out the most efficient routing for plumbing and cabling. AI is operating excavators, scheduling contractors, driving inspection robots, recognizing bad concrete pours from drone images, and the list keeps growing. In China there are entire mines being worked by only robots driven by AI, and AI powers their "lights out" factories.
I don't see any issue with an AI creating legal citations, **IF** it's adequately trained specifically on legal documents with the guard rails in place to only use cases that actually exist and which actually pertain to the topic in question. Obviously ChatGPT and its kin are not up to that task, but they're trained in everything under the sun, and the old rule of GIGO goes into effect. A legal AI doesn't need to know anything about running an excavator, how to feed a goldfish, or the Kardashian sluts' sex lives, including crap like that into your training is going to produce garbage output.