As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHV - FLT 3536 - CREW REPORTED THE EMERGENCY LIGHTS WILL NOT TEST. MAINTENANCE REMOVED AND REPLACED ALL FIVE EMERGENCY LIGHT POWER SUPPLY UNIT IAW SAAB MM. OPERATIONAL CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. REF SIMA200123301 (M)