As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT 3149 THE CREW REPORTED A BURNING RUBBER SMELL WHEN THE APU WAS STARTED. INSPECTED AND FOUND THE SMELL WAS ORIGINATED FROM A MELTING CONNECTOR ON THE COFFEE HOT JUG. THE COFFEE HOT JUG WAS REPLACED. OPERATIONAL CHECKS WERE GOOD.