Thanks for your quick reply! I don’t think I quite have my head around this. Yes – the code you posted works perfect for all excerpts. I’m not quite seeing how to address this for only the map custom post type.
I have tried modifying the ‘get_the_excerpt’ filter, but it appress the mappress excerpt is not responding to that filter.
I found in mappress_poi where the function get_post_excerpt is using wp_trim_words.