The Collaborative International Dictionary of English v.0.48:

Repairer \Re*pair"er\ (-?r), n.
   One who, or that which, repairs, restores, or makes amends.
   [1913 Webster]

WordNet (r) 3.0 (2006):

repairer
    n 1: a skilled worker who mends or repairs things [syn:
         mender, repairer, fixer]