As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND EMERGENCY LIGHTING SYSTEM TEST FUNCTION INTERMITTENTLY WORKING WHEN PRESS TO TEST. EMERGENCY LIGHTING SYSTEM TEST FUNCTION DEFERRED PER MEL 33-50-2. DMP C/W. PLACARD INSTALLED. FOUND EMERGENCY LIGHTING SYSTEM TEST FUNCTION INTERMITTENTLY WORKING WHEN PRESS TO TEST. REMOVED AND REPLACE SWITCH S1-402 REFERENCE SWMP 20-20-03. FUNCTIONAL TEST GOOD REFERENCE AMM 33-50-00-700-801.