As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: WITH AIRCRAFT UN-POWERED AND EMERGENCY EXIT LIGHT SWITCH SELECTED ON, NO EMERGENCY LIGHT OVER 2L AND 2R AND THREE LIGHTS OUT ON OVERHEAD. DISCONNECTED EMERGENCY POWER SUPPLY UNIT 13WL ELECTRICAL CONNECTOR, CLEANED AND RE-CONNECTED THE ELECTRICAL CONNECTOR PER ESPM 20-55-50 AND 33-51-38. A SATISFACTORY OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYSTEM WAS ACCOMPLISHED.