I don't know if this will do strokes on a table, but for other text, strokes and fills, you can use the find/change box. It will take several operations. Find text - leave find and replace boxes blank and just choose character color.
Find object, do one runthrough for fill and one for stroke on all box frames.
So far, I have found no way to select table strokes this way.
Ah, thanks! I hadn't thought about that. It's not perfect, but it certainly makes the process easier.
When you think you've found it all, open the Separations Preview, and turn off the all colors except [Black]. That will make it easy to see if any elements got left behind.