What was found
CARB AIRBOX BUTTERFLY VALVE ATTACHMENT TO ACTUATING SHAFT FAILED BY POORLY SHOT RIVET PULLING THROUGH THE BRACKET HOLE ON RIGHT SIDE. LEFT SIDE RIVET IS LOOSE AS WELL BUT HAD NOT FAILED AT THE TIME OF DISCOVERY. VALVE WAS HANGING DOWN AWAY FROM THE SHAFT. OWNER REPORTED THERE WAS A TIME WHEN CARB HEAT ACTUATION WAS EXTREMELY STIFF BUT LATER GOT EASIER AGAIN. (NO INVESTIGATION AT THAT TIME). THIS IS A VERY NEW, CESSNA FACTORY LOOKING AIRBOX WITH ONLY ABOUT 200 HRS AND 2 YEARS ON IT SINCE NEW. CESSNA HAS BEEN NOTIFIED OF THE FAILURE. ALSO NOTE THAT THE AIRBOX ATTACHING COLLAR RIVETS ARE ALLOWING MOVEMENT . LOOSE AS WELL. THIS AIRBOX DID NOT HAVE THE SUPPLEMENTAL AIRBOX STRUTS INSTALLED. (HIGHLY RECOMMENDED).