What was found
WHILE DESCENDING THRU 10,000' MEAN SEA LEVEL CREW LOST ALL COMMUNICATIONS, ELECTRONIC CENTRALIZED AIRCRAFT MONITOR MESSAGE "STUCK MIC" VERY HIGH FREQUENCY #1 DISPLAYED. SWITCHED TO VERY HIGH FREQUENCY #2 WITH A DIFFERENT MIC. ELECTRONIC CENTRALIZED AIRCRAFT MONITOR MESSAGE "STUCK MIC" VERY HIGH FREQUENCY #2 DISPLAYED. SAME RESULT USING VERY HIGH FREQUENCY #3. CREW SQUAWKED 7600 AND 7700. EMERGENCY WAS DECLARED. ATC COULD NOT HEAR THEM, BUT THEY COULD HEAR ATC, WHO GAVE THEM CLEARANCE TO LAND AND TAXI TO GATE. REMOVED AND REPLACED CAPTAINS CONTROL HANDLE OF THE NEW GEN SIDE STICK UNIT PER AMM 27-92-41.