What was found
OVERSPEED WARNING INOPERATIVE. TESTED ON GROUND AND FOUND OVERSPEED WARNING SWITCH, P/N 9912076-12, S/N 173 TO BE OUT OF CALIBRATION. REMOVED AND REPLACED SWITCH WITH OVERHAULED UNIT, S/N 259. TESTED AND UNIT FAILED. R & R SWITCH WITH INSPECTED UNIT, S/N 09J108. TESTED AND UNIT FAILED. REMOVED AND REPLACED SWITCH WITH OVERHAULED UNIT, S/N 152. TESTED AND UNIT FAILED. REMOVED AND REPLACED SWITCH WITH OVERHAULED UNIT, S/N 191.