As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LEVEL OFF THE F/A CALL LIGHT AT 30A BEGAN SMOKING. CABIN LIGHTS WERE SECURED AND A DEADHEADING CREW MEMBER OPENED THE PANEL AND DISCONNECTED THE SHORTING LEADS FROM THE LIGHT. FOUND CTR READING LIGHT PWR SUPPLY MODULE BURNT. REPLACED OVHD PSU, CHECKS GOOD. MCO AND PLACARD REMOVED.