What was found
AIRCRAFT WAS NOT GROUNDED: AN EMERGENCY WAS DECLARED INTO RSW DUE TO THE FLIGHT CREW REPORTING THAT AFTER TAKEOFF AND GEAR RETRACTION, RECEIVED MASTER WARNING L/G DOWN MULTIPLE TIMES. AFTER LANDING, NAV RA DEGRADED CAUTION MESSAGE. MAINTENANCE RESET RADIO ALT'S PER AMM 34-42-33. ALL MESSAGES CLEARED.