What was found
MAIN DOOR: AMBER CABIN DOOR OPEN CAS ILLUMINATED ON TAKEOFF WHICH CAUSED A NO TAKEOFF WARNING. REJECTED THE TAKEOFF. ACCOMPLISHED THE CABIN DOOR OPEN PROCEDURE. FOUND THE RED CABIN DOOR HANDLE RELEASE BUTTON VERY LOOSE IN ITS HOUSING WHICH IS CAUSING THE AMBER DOOR OPEN ANNUNCIATOR AND THE AMBER CABIN DOOR OPEN CAS MESSAGE TO ILLUMINATE. // SIGNOFF// TIGHTENED JAM NUT FOR INNER HANDLE PUSHBUTTON SWITCH IAW MODEL 680A 52-70-20. OPS CHECK GOOD NO DEFECTS NOTED.