turcotte

My car was jump started with reverse polarity, everything work's in the car except the Comand unit, unit was taken out and the 10a fuse was blown, tried another fuse and it blew again. No visible damage to the circuit board.

Any lead on how fix it would be greatly apreciated. Or any shop that could do the repair. It think i've seem this problem listed in past posting.

Thank's in advance for any help!