What was found
MAIN DOOR: MAIN CABIN DOOR. IN FLIGHT, CLIMBING THROUGH 11,000FT., CABIN DOOR ANNUNCIATOR LIGHT CAME ON. PERFORMED QRH PROCEDURE AND LIGHT REMAINED ON. CONDUCTED A DIVERT, AND CABIN DOOR LIGHT REMAINED ON THROUGH DESCENT, LANDING, AND TAXI. THE LIGHT WENT OUT UPON SHUTDOWN OF AIRCRAFT. AFTER SHUTDOWN, DOOR PIN INDICATORS WERE REVERIFIED, AND ALL INDICATOR PINS WERE SHOWING THE CLOSED AND LOCKED POSITION. // SIGNOFF// REMOVED AND REPLACED MAIN DOOR VENT PROXIMITY SWITCH AND PERFORMED OPS TESTS WITH NO DEFECTS NOTED AT THIS TIME REF CE560XL AMM 52-70-00.