As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS BOTH WARMING OVENS IN FIRST CLASS GALLEY GET TOO HOT AND OVERHEATING WITH AN ELECTRICAL WIRE SMELL, FOUND BURNT STICKY SUBSTANCE IN NR 2 BUN WARMER. MAINTENANCE REMOVED AND REPLACED NR 2 BUN WARMER IAW AMM 25-32-02. OPS NOW NORMAL. NO SMELL EVIDENT DURING OPS CHECK OF BOTH OVENS.