If a test relies on having a functional machine to do the test for you, what reason is there to still learn how to do the test procedures when we can learn how to fix that machine so that it can still fulfill its duty when it fails?
As George stated, the need of the patient takes priority.
Additionally, even if the instrument can be repaired, Good Clinical Laboratory Guidelines require that in all cases equipment used should be demonstrably fit for purpose [1]. Depending on the extend of the repair, this ranges from a system suitability test to a full revalidation, and everything will have to be documented and approved.
UNICEF/UNDP/World Bank/WHO Special Programme for Research and Training in Tropical Diseases. (2009). Good clinical laboratory practice (GCLP). World Health Organization. https://apps.who.int/iris/handle/10665/44092