A B747-200 WAS DISPATCHED IN NON COMPLIANCE WITH LIGHT CORROSION ON C ZONE PAX OXYGEN MANIFOLD LINES NOT DEFERRED OR CORRECTED.

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I WROTE WRITE-UP ZONE 240 ON JUL/MON/00 REGARDING CONTAMINATION OF EXTERIOR LOW PRESSURE OXYGEN MANIFOLDS IN 'C' ZONE. I WAS REINSTALLING PSU'S WHICH HAD BEEN REMOVED DURING THE CHK WHEN I NOTICED THE DINOL CONTAMINATION. JUL/TUE/00 A MECH WHO WAS WORKING THE CARD; ASKED ME TO CONFIRM AN AREA OF CORROSION ON THE AFT R SECTION OF THE 'C' ZONE PAX OXYGEN MANIFOLD. THERE WAS LIGHT CORROSION THERE. I HAVE EXPERIENCE WITH CORROSION ON OXYGEN MANIFOLDS. MGMNT WAS INFORMED VIA MY LEAD. MGMNT CONTACTED ENGINEERING. ENGINEERING AND MGMNT WANTED TO KNOW WHY I HAD WRITTEN A RPT FOR THE DINOL CONTAMINATION WHEN THE JOB CARD DIDN'T REQUIRE THAT TO BE CHKED OUT. I REFERRED THEM TO BOEING MAINT MANUAL REGARDING OXYGEN SYS CLEANLINESS AS WELL AS A BOEING PUB REGARDING 'DINOL CONTAMINATION OF OXYGEN LINES.' THE ENGINEER LEFT TO RESEARCH THE PROB (CORROSION). MY SHIFT WAS OVER AND MY VACATION STARTED THE NEXT DAY. I WAS BACK FROM VACATION AND ASKED ABOUT THE CORROSION. MY CREW MATES TOLD ME THEY DIDN'T BELIEVE A CARD HAD BEEN WRITTEN FOR IT. INSPECTION DEPT DOESN'T BELIEVE THERE ARE ANY REQUIRED INSPECTIONS FOR CORROSION OF OXYGEN SYS COMPONENTS. I SAW THE CORROSION; MY LEAD SAW IT; INSPECTION SAW IT; ENGINEERING SAW IT; MGMNT SAW IT. WE MECHS AND INSPECTION DON'T THINK IT'S AN IMMEDIATE SAFETY HAZARD. I WOULD GUESS LEVEL 1-2 CORROSION AT THIS TIME; BUT IT SHOULD BE ADDRESSED BEFORE TOO LONG. THE PAX OXYGEN SYS PASSED LOW PRESSURE MANIFOLD LEAK CHK AS WELL AS SYS CHK. A CARD SHOULD HAVE BEEN WRITTEN AND THE CORROSION REMOVED. THE ACFT WAS RUNNING LATE IN CHK AND THIS WAS SOMETHING THAT MGMNT PROBABLY DIDN'T WANT TO DEAL WITH.