As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE MAINTENANCE AT DFW, IT WAS DISCOVERED THAT THE L1 EMERGENCY EXIT LIGHT WOULD NOT TEST. FOUND INCORRECT UNIT INSTALLED. REMOVED AND REPLACED WITH CORRECT PART NR EMERGENCY EXIT LIGHT ASSEMBLY. OPERATIONALLY CHECKED GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE. (M)