What was found
PILOT DEVIATED FROM ASSIGNED ALTITUDE OF FL 330 AFTER HE APPARENTLY RECEIVED A SECOND RA VERBAL ALERT TO DESCEND WHILE APPROACHING ANOTHER AIRCRAFT AT ASSIGNED ALTITUDE OF FL 310. PILOT SAID HE HAD TCAS II UNIT CHECKED AT A REPAIR STATION AND UNIT CHECKED GOOD. AN ALLIED SIGNAL REPRESENTATIVE COULD FIND NO DEFECTS AFTER INSPECTING THE AIRCRAFT AND TCAS II UNIT. PILOT OF THE OTHER AIRCRAFT DID NOT HAVE A TCAS RA ALERT. ALLIED SIGNAL REPRESENTATIVE AT OLATHE, KS AND RESPECTIVE FAA MIDO OFFICE HAS BEEN CONTACTED ABOUT THIS INCIDENT. ATC DOCUMENTATION IS BEING FORWARDED TO THE RESPONSIBLE MIDO OFFICE.