As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE HOLDING SHORT OF DEPARTURE RUNWAY THE SERVICE DIRECTOR OPENED THE OVEN TO CHECK THE STATUS OF J-CLASS SNACKS AND GREY BLUE SMOKE AND BURNING SMELL FROM AN UNDETERMINED SOURCE SPREAD FORWARD THROUGH THE CABIN. SMOKE CLEARED AND FLIGHT CONTINUED. THE OVEN REMAINED OFF FOR THE BALANCE OF THE FLIGHT. CLEANED AND OPS CKD OK.