What was found
DURING PREFLIGHT CHECKS, EMERGENCY LIGHT TOGGLE SWITCH WAS STUCK IN OFF POSITION AND BROKE OFF WHEN MOVED TO ARM POSITION. NO REFERENCE REQUIRED PLACED EMERGENCY LIGHT SWITCH TO OFF/DISARM POSITION. LRD U IDENTIFIED PARTS TOGGLE SWITCH. COURIER COMPARTMENT INTERIOR EMERGENCY LIGHTS ALL- INOP. NO JUMPSEATERS ALLOWED TO OCCUPY THE COURIER AREA. EMERGENCY LIGHT TOGGLE SWITCH 22WL NIS IN LRD. SWITCH MOVED TO OFF/DISARMED POS. REPLACED EMERGENCY LIGHT TOGGLE SWITCH REF IPC 33-51-08-01A TEST NORMAL REF AMM 33-51-00-05-09.