As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A PREFLIGHT CHECK, EXTERIOR EMERGENCY EXIT LIGHTS DID NTO ILLUMINATE. MAINTENANCE DISCOVERED THE EMERGENCY EXIT LIGHT SWITCH WAS NOT WORKING. MAINTENANCE REMOVED AND REPLACED THE EMERGENCY EXIT LIGHT SWITCH IAW BOEING MM 33-51-01. EXTERIOR EMERGENCY LIGHTS NOW ILLUMINATE. (M)