We were talking about this at the shop and the other guys shared this story with me:
Several years ago a new guy found a leak in a tower in a market. So he calls the on call lead and the lead says "You need to raise the pressure in there to pinpoint the leak. I can help you in about 3 hours."
When the on call lead shows up he sees that the guy had cut the headers from the individual circuits at the tower and brazed access valves to each circuit and was planning on pumping nitrogen into each circuit. After a good chewing out from the on call lead on how it should have been done, they get to work on the repairs.
I can't imagine how long repairs would have taken.
Yes, he was gone the next day.