My guess is you have a nail/screw somewhere in your tire. Depending on the location on the tire, it can be plugged for around $20 and you’ll be on your way.

Omg yes

after 5 years those tires should be replaced.

What you want doesn't fall under rotate/balance.

guys, tell me if i am being unreasonable. i bought my tires from walmart a few years ago (like 5 years?) w/ a lifetime rotate/balance deal. one of the tires is losing air (at least 5 lbs a day) and i want to take it back and have them reseal/remount the tire for free. am i being unreasonable?