What was found
(CAN) DURING SCHEDULED MAINTENANCE ON THE PITOT STATIC SYSTEM WHILE PREFORMING THE 24 MONTH RECERTIFICATION TASKS FOR THE ALTIMETERS, AIR DATA COMPUTERS AND TRANSPONDERS, MAINTENANCE DISCOVERED A LEAK IN THE PITOT STATIC SYSTEM LOCATED AT THE ALTERNATE STATIC SELECTOR VALVE. THE BRASS FITTING, PN 2202P-2-2, WAS FOUND TO BE CRACKED CAUSING THE LEAK. THERE WAS NO INDICATION FROM ANY AIR CREW MEMBERS THAT THERE WAS ANY PROBLEM WITH THIS SYSTEM. MAINTENANCE REPLACED THE FITTING WITH A SERVICEABLE UNIT AND A SATISFACTORY PITOT STATIC TEST WAS CARRIED OUT, THE ACFT WAS RETURNED TO SERVICE.