What was found
DURING PRE-DEPARTURE INSPECTION, WHILE PERFORMING EMERGENCY EXIT POWER LIGHT TEST, ALL CEILING LIGHTS IN FLIGHT DECK AND COURIER AREA INOPERATIVE. TROUBLESHOT SYS AND FOUND POWER BEING DRAWN TO A GROUND FROM POWER SUPPLY NOT PROVIDING ENOUGH VOLTAGE TO LIGHTS. FOUND RT EXIT DOOR AFT EMERGENCY LIGHT ASSY MISSING SCREWS, DROOPING DOWN, AND SHORTING TO METAL FRAMEWORK. RESEATED WITH NEW SCREWS AND EMERGENCY CEILING LIGHTS OPS CHECKED GOOD IAW MM 33-52-04-2.