As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - DURING A-CHECK INSPECTION, THE EMERGENCY LIGHTS ASSOCIATED WITH POWER SUPPLY 3WL DID NOT ILLUMINATE. MAINTENANCE REMOVED AND REPLACED THE BATTERY PACK IN THE ASSOCIATED POWER SUPPLY AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)