What was found
CREW REPORTED WEATHER RADAR INOPERATIVE UPON LANDING. MAINTENANCE REMOVED AND REPLACED THE RECEIVER/TRANSMITTER AND THE WAVEGUIDE ASSY. IAW MFG MM 34-43-0, AND 34-41-11, SYSTEM OPERATIONALLY CHECKED NORMAL IAW MM 34-40-0 AND 34-41-0. AIRCRAFT WAS RETURNED TO SERVICE. AIRCRAFT DEPARTED, CREW REPORTED THE WEATHER RADAR FAILED AFTER TAKE-OFF. AIRCRAFT RETURNED WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE RADAR ANTENNA AND THE RADAR INDICATOR IAW MM 34-41-12 AND 34-41-0. OPERATIONALLY CHECKED NORMAL. AIRCRAFT WAS RETURNED TO SERVICE.