As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FORWARD GALLEY OVEN 401, RIGHT SIDE OVEN SMOKING/SPARKING. CAPTAIN ADVISED TO PULL CB. OVEN REPLACED IN SFO ON 02APR99. SHOP FINDINGS ON REMOVED OVEN MR25350-170 FOUND IT TO BE EXTREMELY DIRTY ESPECIALLY BEHIND THE SIDE AND REAR BAFFLE PLATES. THIS CAUSED THE RESIDUE TO SMOKE AT HIGH TEMPS.