rncam wrote:
I had a HVAC guy come in and help balance the heating for my home.
This person found out that the air return in a couple of rooms
upstairs is not working (when he put a small piece of toilet paper
against the grill - it was not being sucked up against the grill).
Is there any way I can get this fixed without having someone tear
down the walls? Do I have any other options? Thank you!


Yeah, you could forget about it!

You didn't say whether lack of air return in these two rooms was a problem,
or even noticeable.