A B747-400 CAPT EXPRESSES CONCERN OVER THE LACK OF MAINT ACTION ON INTERIOR LAVATORY WATER LEAKS AND WHERE THE WATER IS LEAKING TO IN FLT.

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APPROX 1 1/2 HRS BEFORE LNDG IN VHHH; THE RELIEF FO RPTED TO ME THAT HE HAD LOST HIS NAV DISPLAY. THE CRT WAS BLANK AND INOP. THIS; IN ITSELF PRESENTS NO SERIOUS PROB. MY CONCERN IS A POSSIBLE CONNECTION TO EVENTS THAT MAY HAVE LED UP TO THIS. BEFORE DEP; THE PURSER SAID THAT THERE WAS A LOT OF WATER ON THE LAVATORY FLOOR BY DOOR 1L. WE CONTACTED MAINT AND THEY HAD IT VACUUMED. WE ASKED IF THE PROB HAD BEEN FIXED. (A PREVIOUS WRITE-UP LISTED A PROB WITH A DRAIN MAST) WE WERE ASSURED THAT EVERYTHING WAS OK. BEFORE DEP; WE CALLED OPS AGAIN AND THEY VERIFIED THAT THE PROB WAS TAKEN CARE OF. NOTHING SPECIFIC. ON CLB; THE PURSER RPTED THAT WATER WAS RUNNING OUT OF THE LAVATORY ONTO PAX SHOES. SHORTLY AFTER REACHING CRUISE; THE PURSER RPTED THAT 3 LAVATORIES HAD WASH BASINS OVERFLOWING. I CALLED MAINT; AND THEY GAVE US THE OPTION OF TURNING OFF THE VALVES UNDER THE SINK. THIS WOULD DISABLE THE FAUCETS AND THE FLT ATTENDANTS WOULD HAVE TO DUMP WATER INTO THE TOILETS SO THEY WOULD FLUSH. THE CARPETS WERE SO WET; THEY BLOCKED OFF THE LAVATORIES. AT APPROX THE SAME TIME THAT THE FO LOST HIS CRT; THE PURSER RPTED THAT ALL OF THE LAVATORIES IN FIRST CLASS AND IN BUSINESS CLASS WERE NOW INOP. MY CONCERN WAS; WHERE IS ALL OF THE WATER GOING. I DO NOT KNOW IF THERE IS A CONNECTION BTWN WATER POSSIBLY DRIPPING OR RUNNING INTO PLACES UNKNOWN AND THE LOSS OF SOME OF MY ELECTRONIC INSTRUMENTATION. IF THERE IS A POSSIBLE CONNECTION; I WOULD HOPE THAT THESE TYPES OF GRIPES ON THE GND WOULD RECEIVE SERIOUS ATTN IN SPITE OF THE HIGH PRESSURE ON THE GND PEOPLE TO GET THE FLT OUT ON TIME. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE WATER WAS LEAKING OUT OF THE FORWARD LAVATORY INTO THE FIRST CLASS AND BUSINESS SECTION OF THE CABIN AND SOAKING THE PAX SHOES. THE RPTR SAID THE FACT THAT THE FOS NAV DISPLAY WAS LOST MAY NOT BE CONNECTED TO THE WATER LEAK; BUT SHOULD BE CONSIDERED. THE RPTR STATED THE AIRPLANE HAD WET CARPETS PRIOR TO DEP AND THE ONLY MAINT ACTION WAS TO VACUUM THE CARPETS. THE RPTR SAID THE MAIN CONCERN IS WHERE IS THE WATER LEAKING TO AND IN WHAT COMPARTMENT?