non working defrost

Rear window defrost does not work. Checked the fuse and it is ok.
What could be the problem? I know a mechanic changed the fuse on the OVP relay 3 weeks ago. Coul he had moved something by mistake?

Karle
Mercedes 190e 1988 2.3
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Take the fuse out and put in a new one. It looks okay but it is not... basically it is corroded.
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fuse. take it out - probably burned or no contact. new in.
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