AN AIRBUS A319 ACFT WAS FOUND TO HAVE THE # 2 ENG DRAIN MAST MISSING FROM THE LOWER SIDE OF THE ENGINE FAN CASE.

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ENG CHANGE WAS ACCOMPLISHED AT ZZZ. ACFT FIRST MORNING FLT WAS TO ZZZ1. AT ZZZ1 DURING PLT'S PREFLT WALKAROUND IT WAS DISCOVERED THAT THE #2 ENG DRAIN MAST WAS NOT INSTALLED. THE OUTCOME WAS THAT THE ACFT TOOK A DELAY OUT OF ZZZ1 AND LCL ZZZ MECHS WERE FLOWN IN TO INSTALL THE DRAIN MAST. THE INSTALLED ENG WAS GIVEN A LCL ABBREVIATED C-CHK PRIOR TO INSTALLATION; DRAIN MAST WAS REMOVED WITHOUT LCL INSPECTION DEPT NOTIFIED; SERVICEABLE TAG WAS ISSUED TO ENG WITH DRAIN MAST NOT INSTALLED. THE ENG SHOP PERFORMING THE MAINT ON THE ENG CREATED A WRITE-UP THAT THE DRAIN MAST WAS REMOVED BUT FAILED TO FLAG SAID WRITE-UP AS AN RII. THE WRITE-UP GENERATED BY THE ENG SHOP WAS SIGNED OFF BY A MECH AS; FOUND DRAIN MAST INSTALLED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE LOCATION OF THE DRAIN MAST WAS; IN FACT; ATTACHED TO THE LOWER SECTION OF THE FAN CASE. REPORTER ALSO STATED HE COULD NOT EXPLAIN WHY A MECHANIC SIGNED-OFF A WRITE-UP WITH THE STATEMENT OF FOUND DRAIN MAST INSTALLED WHEN; IN FACT; THERE WAS NOT ONE ATTACHED TO THE FAN CASE.