A place to start is:
http://www.mfjenterprises.com/custserv.php
Radiodoc
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:Hi: My MFJ Antenna Analyzer, model MFJ-247 quit working after I dropped it. Apparently the SWR meter, P/N 400-0036, is broken and the battery case is also broken. Does anyone know where I can get replacement parts so I can repair it myself or where I can send it for repair. Any help will be appreciated as I really miss it. Dick