A fulfillment test of a computing system having components is performed within a build-to-order test phase. Responsive to the fulfillment test failing, the component that most contributed to the fulfillment test failing is replaced, regardless of whether the given component was determined to be suspect or marginally defective pursuant to a fabrication test previously performed within a build-to-plan test phase. Any other component of that contributed to the fulfillment test failing and that was determined to be suspect or marginally defective pursuant to the fabrication test previously performed within the build-to-plan test phase is also replaced.