A B767-200 ROUTED ON AN EXTENDED RANGE OP DIVERTED DUE TO FAILURE OF BOTH LAVATORY FLUSH SYS CAUSED BY FAILURE TO PROPERLY SVC THE LAVATORY SYS PRIOR TO DEP.

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ACFT WAS FLYING ETOPS FROM ZZZ TO GERMANY AND DIVERTED TO IRELAND DUE TO INFLT SHUTDOWN OF BOTH LAVATORY SYS. PRIOR TO DEP; I SIGNED OFF PART OF A WORK CARD STATING THAT I VERIFIED THE PROPER SVCING OF THE LAVATORY SYS; BUT I DID NOT ACTUALLY WITNESS THE SVCING OF THE LAVATORIES. I WAS SUBSEQUENTLY DISCIPLINED BY MY COMPANY. THE FACTORS THAT CAUSED THIS WERE THE FACT THAT THE LEAD UTILITY PERSON WAS NOT CONCERNED ABOUT ISSUING THE LAVATORY SVCING PAPERWORK TO THE PERSON WHO WAS SUPPOSED TO DUMP AND SVC THE LAVATORIES. THE PERSON WHO WAS ACTUALLY SUPPOSED TO PERFORM THIS FUNCTION WAS HEARD TO SAY THAT WITHOUT THIS FORM THEY WERE NOT GOING TO DUMP THE LAVATORIES EVEN THOUGH SHE KNEW IT WAS HER RESPONSIBILITY TO DO SO. I HAD SEEN LAVATORY TRUCKS IN THE AREA AND ASSUMED THIS JOB WAS DONE. I OPERATED ALL THE LAVATORIES BEFORE DEP AND THEY ALL WORKED NORMALLY. AS FOR CORRECTIVE ACTIONS: IT SHOULD BE THE RESPONSIBILITY OF THE LEAD UTILITY AND UTILITY PERSON TO SIGN FOR THIS JOB ON THE ETOPS PAPERWORK. THIS ACFT AND FLT HAS A LIMITED GND TIME AND THE MECHS ONLY HAVE A SHORT TIME TO RE-POS THE ACFT; PERFORM A CRITICAL ETOPS SVC CHK; AND FIX ALL LOGBOOK SQUAWKS. WE CANNOT ALWAYS BE CONCERNED WITH WATCHING OVER UTILITY PEOPLE TO MAKE SURE THEY ALSO DO THEIR JOBS PROPERLY.