Rossi had backup systems alright and fluid temps might have been able to remain somewhat constant in the system, even during the "down" days, very possibly because of certain "other systems" on the "customer" side that have recently been discovered.
Did someone recently visited the Plant? I thought it has been sealed. As IHFB reminded us, we all were warned that there was anything significant over the wall ("I.H. people and others have now seen the customer facility. They now know there is nothing but a radiator and fan"; "IH has 3rd party proof that the "customer" side just contained a large radiator"; "Govt agencies witnessed the "customers radiator and Rossi I his attorney will have some explaining to do in front of the judge very soon"). Can we assume that someone has recently made a stroll from the Customer's side?