WordNet (r) 3.0 (2006):

serviceability
    n 1: the quality of being able to provide good service [syn:
         serviceability, serviceableness, usableness,
         useableness, usability]

The Free On-line Dictionary of Computing (30 December 2018):

serviceability

    The ease with which corrective maintenance or
   preventative maintenance can be performed on a system (e.g. by a
   hardware service technician).  Higher serviceability improves
   availability and reduces service cost.

   Serviceability is one component of RAS.

   (2000-08-13)