As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OPERATIONAL CHECK FOR MACH DISCREPANCY, FIRE WAS NOTICED AT LUMINAIRE TERMINAL BLOCK ABOVE SEATS 17 AND 18G. POWER WAS SECURED AND NO OTHER DAMAGE VISIBLE. MAINTENANCE REMOVED AND REPLACED LUMINAIRE AND LUMINAIRE TERMINAL BLOCK ABOVE SEATS 17 AND 18G IAW MM 33-21-04. AIRCRAFT RETURNED TO SERVICE. (M)