Check for a specific category for a post

I would like to check the categories for a single post and then display an image for within each post matching a specific category. The following script is not working in the single.php file. I appreciate any help!

<?php
$category = get_the_category();
foreach ($category as $value)
{
if ($value == ‘routine maintenance’){echo “<img src=’image.jpg’>”;}
}
?>