As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED IN SRQ THE LEFT CABIN LOWER EXIT SIGN INOP. MAINTENANCE TESTED USING THE AIRCRAFT MAINTENANCE MANUAL AND FOUND NR 4 EPSU BAD. MAINTENANCE REMOVED AND REPLACED NR 4 EPSU. MAINTENANCE CHECKED THE AIRCRAFT USING THE AIRCRAFT MAINTENANCE MANUAL AND RETURNED THE AIRCRAFT TO SERVICE.