re: How to tell your employer you are bored in your job

No one cares if you're bored, so forget that language. They care that you're not being used to maximum productivity....so volunteer for more work. Tell your boss that your tasks have become routine, so you're able to do them efficiently, and you have unused capacity....ask if s/he needs assistance with any major projects.

But drop the term "bored". You're not a kid on summer vacation. Everyone is bored with routine tasks--that's why we have to pay people to do them. If it was super-fun-tastic, someone would be doing it for free.