I got a ticket for a remote site that said "there's an error message and the computer doesn't start" . there was no clarification what the error message actually said.

I spent about 20 minutes driving out there, turn the computer on:

"System battery voltage low. Press F2 to continue"

I did not have a battery with me. If they just said what the error was, I would have brought a battery with me. Now they have to wait for another tech to be scheduled to drive out to this location which could be a week later.