Mr. Fixit.....

My parents have three rental homes (I play handyman). Last year one of the tenants called and said the garage door wouldn't go down (I had replaced the opener not long before and reused the old sensors). I looked this problem up on the internet. Sure enough, the most common cause was the issue, sunlight hitting the receiver at just the right time of day, BUT the tenant had already swapped them side to side, but they weren't aligned well...

Same tenant called a week ago. Porch light wasn't working with a brand new bulb (weird two-pin LED). He didn't realize that modern porch lights have a light sensor and won't come on until it's dark outside...