Here are a couple:

http://www.foreignecurepair.com/rnr.htm

http://ecmtogo.com/

I did an Internet search of Mitsubishi and foreign car ecm repair shops and a few show up requesting you send the ecm and they'll repair it for under $200 but they don't list a contact number...just...

Had a guy contact me today, he has a 2003 Mitsubishi Fuso with 4D34 engine.

The ecm numbers are: MK369413 407914-3920

Originally the vehicle would stop running, he would replace the ecm fuse...