A B747-100 UNABLE TO PRESSURIZE AFTER DEP FROM ANC RETURNS TO LAND.

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ACFT CLBING OUT ON DEP 717400 LBS TKOF GROSS WT; CABIN PRESSURIZATION NOT WORKING CORRECTLY. FOUND LOWER ELECTRICAL SVC DOOR INDICATED OPEN. LEVELED OFF AT 6000 FT MSL; COULD NOT GET DOOR TO SEAL WITH EITHER MANUAL OR AUTOMATIC PRESSURIZATION. CONTACTED COMPANY AND ENTERED HOLDING. GIVEN CHOICE OF EITHER OVERWT LNDG OR DUMPING FUEL. CREW ELECTED TO MAKE MAX LNDG 585000 LBS TO AVOID BLOWING WHEELS AND TIRES. MADE UNEVENTFUL LNDG AT ANC. DID NOT DECLARE AN EMER BUT DID NOT CHANGE DEST OF FLT PLAN FROM OSAKA; JAPAN; TO ANCHORAGE. DID NOT REALIZE THIS UNTIL RETURN TO USA ON MAR/XX/97. WHEN FILLING OUT COMPANY RPT FORGOT FLT PLAN; AS WE WERE ALL TRYING TO FIGURE OUT LNDG ROLL DISTANCES WHEN OVERWT AND AT WHAT POINT THE FUSE PLUGS IN THE WHEELS WOULD MELT; ONLY DATA AVAILABLE WAS FOR MAX BRAKING ON TKOF AT 115 KTS; VREF AT 700000 LBS WOULD HAVE BEEN 170 KTS. AS CAPT; I CONSIDER CHANGE OF DEST A MINOR POINT AS WE STAYED IN CONTACT WITH THE COMPANY OPS. THEY DID NOT REMIND US OF THE REQUIREMENT EITHER. UNEVENTFUL LNDG MADE. REFUELED AND CONTINUED TRIP TO OSAKA AFTER E&E DOOR WAS VERIFIED CLOSED AND PRESSURIZATION WAS CHKED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CAPT HAD ENOUGH EXPERIENCE ON THE B747 TO KNOW THAT IT WOULDN'T BE PRESSURIZING. THEY WORKED TOGETHER AS A FLC; MAKING THE DECISION TO DUMP FUEL; RETURN TO LAND AND FIX THE PRESSURE PROB. IT ALL WORKED WELL; MAKING A LNDG AT MAX LNDG WT. PRESSURE PROB WAS FIXED BY MAKING SURE THE ELECTRONIC COMPARTMENT DOOR WAS PROPERLY SHUT. FLC THEN WENT ON TO COMPLETE THEIR ASSIGNED FLYING TO OSAKA. FLC WROTE RPT MAINLY BECAUSE THEY WERE NOT SURE THEY HAD CHANGED DEST FROM OSAKA BACK TO ANC WITH THEIR COMPANY. SUPPLEMENTAL INFO FROM ACN 362800: FE NOTICE AND ANNOUNCED AN E&E 'DOOR OPEN' LIGHT ILLUMINATE. AFTER LEVELING OFF AT 6000 FT AND COORDINATING A HOLDING PATTERN WITH ATC; THE APPROPRIATE ABNORMAL PROC WAS FOLLOWED. ADDITIONALLY MAINT AND COMPANY DISPATCH WERE NOTIFIED THAT WE WOULD RETURN TO ANCHORAGE. THE ABNORMAL CONDITION WAS CORRECTED; THE ACFT REFUELED; AND THE FLT COMPLETED AS ORIGINALLY PLANNED. AFTER RE-EVALUATING OUR PERFORMANCE LATER; WE DISCOVERED THAT WE FAILED TO OBTAIN AN 'ARTR' (AMEND RELEASE TO READ) FROM DISPATCH FOR OUR UNSCHEDULED RETURN TO ANCHORAGE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: PLT WAS THE PF AND STATED THAT CRM WAS GOOD. ALL DECISIONS WERE FLC DECISIONS AND EVERYTHING WORKED OUT WELL IN USING THE PROPER PROCS. PLT WAS MORE CONCERNED THAT HIS COMPANY WOULD FIND FAULT SOMEWHERE IN ALL THEIR DECISIONS. THERE IS MUCH LABOR AND MGMNT STRIFE GOING ON IN HIS EMPLOYMENT.