Given the air of mystery around the robot, I would first ask around among my mates, or perhaps friends of family. Even if they are not tech-savy, they may recommend someone reliable. 

If you live in an apartment, your building will also certainly have a robot specialist on payroll, for daily repairs. If not, try searching for a robot repair den with good reviews in your area. But make sure they don't replace any original parts with cheap Martian equivalents, as they so often tend to do.
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