As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RED EMERGENCY LIGHTS BETWEEN ROWS 10 THROUGH 12 AND WHITE EMERGENCY LIGHTS BETWEEN ROWS 13 THROUGH 15 ILLUMINATED FOR 15 MINUTES IN FLIGHT AND THEN WENT OUT. DISCREPANCY COULD NOT BE DUPLICATED BY MAINTENANCE ON GROUND. REPLACED POWER SUPPLY AT AFT LEFT OVERWING EMERGENCY EXIT AS A PRECAUTION. AIRCRAFT RETURNED TO SERVICE.