Key legal question
Whether the defect notice was timely under Art. 201 CO.
Extracted holding
The notice was late because the buyers were already in possession in July 2001 and, after the first leaks and the technician's warning, could understand the defect's significance; reporting only in May 2002 was not prompt.
Extracted reasoning
For defects appearing after delivery, notice must follow discovery immediately. Discovery occurred when the buyers became aware of the leaks' import, not only when later leaks recurred.