As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAS - AIR TURN BACK - FLT 797 - ON CLIMB-OUT FROM LAS EN ROUTE TO PDX FLIGHT ATTENDANT REPORTED SMOKE AND A LOUD POP FROM THE FWD COFFEEMAKER. MAINTENANCE DISCOVERED THE WATER HEATER ELEMENT SHORTED. MAINTENANCE REMOVED COFFEEMAKER AND COLLARED CIRCUIT BREAKER THEN PLACED ON MEL. TEAR DOWN REPORT ATTRIBUTES THE FAILURE OF THE COFFEEMAKER TO WATER BEING ABSORBED INTO THE MAGNESIUM OXIDE CORE OF ONE HEATER IN THIS UNIT.