As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SBP - FLT 3074 - WHEN EMERGENCY LIGHTS ARE SELECTED ON, LIGHTS START SHUTTING OFF AFTER ABOUT ONE MINUTE. MAINTENANCE REMOVED AND REPLACED EMERGENCY LIGHTING POWER SUPPLY 22LN. OPERATIONAL CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)