Provavelmente, o mais próximo que chegamos é na série de TV Clone Wars, onde encontramos um Clone abandonado chamado Cut Lawquane. Já que ele está se escondendo do Império e apóia os Jedi, eu acho que podemos razoavelmente assumir que seu chip já está danificado de alguma forma e que ele teria recusado a Ordem 66 se ele a recebesse.
Em outro lugar no livro EU, vemos em Lord das Trevas: A Ascensão de Darth Vader que nem todos os clones obedeceram a Ordem 66. Um esquadrão inteiro foi desonesto devido a sua afeição e lealdade pessoal ao seu general Jedi
“Word has reached me,” Palpatine was saying, “that a group of clone troopers on Murkhana may have deliberately refused to comply with Order Sixty-Six.”
Vader tightened his hold on the lightsaber. “I had not heard, Master.”
He knew that Order Sixty-Six had not been hardwired into the clones by the Kaminoans who had grown them. Rather, the troopers-the commanders, especially-had been programmed to demonstrate unfailing loyalty to the Supreme Chancellor, in his role as Commander in Chief of the Grand Army of the Republic. And so when the Jedi had revealed their seditious plans, they had become a threat to Palpatine, and had been sentenced to death.
On myriad worlds Order 66 had been executed without misfortune-on Mygeeto, Saleucami, Felucia, and many others. Taken by surprise, thousands of Jedi had been assassinated by troopers who had for three years answered almost exclusively to them. A few Jedi were known to have escaped death by dint of superior skill or accident. But on Murkhana, apparently unique events had played out; events that were potentially more dangerous to the Empire than the few Jedi who had survived.
“What was the cause of the troopers’ insubordination, Master?” Vader asked.
“Contagion.” Palpatine sneered. “Contagion brought about by fighting alongside the Jedi for so many years. Clone or otherwise, there is only so much a being can be programmed to do. Sooner or later even a lowly trooper will become the sum of his experiences.”