small component in staodyn maxima III

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small component in staodyn maxima III

Hoping someone can help me out here. I'm trying to repair a staodyn maxima unit. There are 3 small black rectangular components on the board and one fried. They  measure about an eighth of an inch by 3 16ths of an inch with a small yellow dot in the corner. The piece has 4 legs soldered to the board and it appears to have a copper winding within. I haven't come across these before and there aren't any markings on it ( letters, numbers etc.). Can anyone help me out as to what this is so I can replace it? Thanks.

I tried to take a pic but it comes out to blurry


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