No more kamma and vipaka for Noble Ones?
The effort of Sekha is merely intuition of mind to remain empty. Only when mindfulness &amp; wisdom of non-Arahant Sekha lapses is there thought of kamma-vipaka. 

For Sekha with mindfulness, wisdom knows only the element of ignorance is the doer of kamma. For the mindful Sekha, "old kamma" is merely something "felt" (rather than identified with), per SN 12.37. In AN 3.61, it is said: "For those who feel, I teach the four noble truths" (of non-craving &amp; non-identifying).