What was found
UPON INSTALLATION OF NEW REPLACEMENT CIRCUIT BREAKERS TO COMPLY WITH AD 2008-13-7, IT WAS FOUND THAT TIGHTENING OF SWITCH RETAINER NUT ON THE INSTRUMENT PANEL CAUSED SWITCH SEPARATION AND FAILURE. AS THESE SWITCHES HAVE TO SUPPORT THE BUSS AND WIRE BUNDLE, IF A FAILURE (SWITCH SEPARATION) OCCURS IN FLIGHT DUE TO VIBRATION, THE ENSUING RESULT WOULD BE WORSE THAN THE INTENT OF THE ORIGINAL AD TO AVOID SMOKE IN THE COCKPIT. QUALITY OF NEW REPLACEMENT PART NOT AS GOOD AS ORIGINAL