English translation: warranty and aftermarket service manager
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Explanation: Warranty and after warranty service have nearly 500 hits on Google.
You can also say Head of ....
Consumers in need of warranty and after-warranty service can choose from over 100 Authorized M.T.H. Service Centers. Each has been trained to provide complete warranty and non-warranty service of all M.T.H. products near where you live. http://www.mth-railking.com/service/center.asp