Linked article:

"An error on a Taylor ice cream machine could look something like this: "ERROR: XSndhUIF LHPR>45F 1HR LPROD too VISC," according to WSJ. Taylor rebutted and said any codes that appear on its machines can be easily found in the machine’s manual."

Hm, what does this remind me of?

“But the plans were on display…"

“On display? I eventually had to go down to the cellar to find them.”

“That’s the display department.”

“With a flashlight.”

“Ah, well, the lights had probably gone.”

“So had the stairs.”

“But look, you found the notice, didn’t you?”

“Yes,” said Arthur, “yes I did. It was on display in the bottom of a locked filing cabinet stuck in a disused lavatory with a sign on the door saying ‘Beware of the Leopard.”