Unit is a mitsubishi, looks like this:
It is on wall brackets, 3 ft from the ground. I suspect the big problem is the oval slots on the end and back. They are seriously big, like jam three fingers in.
I picked up 1/4" hardware cloth last night, so will use that. I was wondering if bug screen would clog and be more of an issue, thank you for your feedback on that. I had a friend who had a window AC fan blocked by a yellow jacket's nest but at least that was an easy fix...he found it after the nest was dead and once removed, his unit still worked.
Part of the issue with repairs is what I have time for and what my repair guy is willing to do. This unit is computer controlled, has a VFD for the fan, etc. Pretty sure the main board has been fried. Not sure on the actual compressor motor but there are enough parts in there that are messed up that my guy can't get parts for, he's looked. And have I mentioned that the whole thing stinks like crazy?
Going to get hot again this week, it will be good to have it done, we are scheduled for tomorrow.
Next thing is to see if I can put screws in it to mount the hardware cloth or if I will have to come up with some way to surface mount it.