Pride Plumbing was called out for a toilet not flushing. We first inserted a camera into the outside main sewer septic drain line at a cleanout, and it only revealed a belly in the line, but no blockage. So, we removed the bathroom sink's P-trap and flushed the toilet, and it flushed like it should. This told us that there was a venting issue in the bathroom. We then replaced the air admittance valve underneath the bathroom sink and doing that corrected the issue.
