What was found
THE FLIGHT DIVERTED WITH A VENT AVIONICS SYSTEM FAULT. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. THE AIRCRAFT WAS GROUNDED. MAINTENANCE TROUBLESHOT, AND FOUND THE SKIN AIR VALVE 22HQ CONNECTOR, PIN C WAS UNABLE TO LOCK. REPLACED THE CONNECTOR IAW ESPM 20-44-11. OPS CHECKED GOOD.