What was found
WEATHER RADAR FAILED. RETURNED TO FIELD. *S/D* THE WEATHER RADAR MALFUNCTION COULD NOT BE DUPLICATED ON THE GROUND. SINCE THE RT UNIT HAD BEEN PREVIOUSLY REPLACED IT WAS DECIDED TO REPLACE THE ANTENNA DRIVE UNIT AND THE ANTENNA FLAT PLATE. A NON-REV VERIFICATION FLIGHT WAS PERFORMED AND THE SYSTEM OPERATION WAS NORMAL. AT THIS TIME THE REMOVED UNITS HAVE NOT BEEN RETURNED FOR SHOP TESTING TO DETERMINE WHICH UNIT WAS THE CAUSE OF THE MALFUNCTION.