ACR FLC TAXIES PAST APPROPRIATE HOLD SHORT LINE OF INTENDED TKOF RWY.

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3 MEMBER CARGO CREW WERE OPERATING SCHEDULED MD11 CARGO FLT FROM HONG KONG TO ANC. IMMEDIATELY PRIOR TO START-UP; SIGNIFICANT MAINT WAS PERFORMED ON ENG DRIVEN HYD PUMP SYS NECESSITATING OP OF THE HYD SYS IN MANUAL VICE NORMAL AUTOMATIC OP. THIS NECESSITATED MORE INVOLVED CREW PROCS AND CHKLISTS; BOTH PRIOR TO AND AFTER START; AND REQUIRED EXTRA DUE DILIGENCE TO VERIFY THE SUBJECT SYS WERE WITHIN LIMITS AND FUNCTIONING NORMALLY. TAXI INSTRUCTIONS WERE RECEIVED AND ACFT WAS CORRECTLY TAXIED AND HOLDING SHORT AT THE CAT II HOLDING POS FOR RWY 25L. CREW PROPERLY CHKED IN WITH TWR WHILE HOLDING SHORT. THEREAFTER; THE BEFORE TKOF CHKLIST MANDATED FURTHER CONFIGN OF THE HYD SYS AND CREW ATTN TO VERIFY SYS WAS FUNCTIONING PROPERLY. DURING THIS PROCESS TWR ADVISED ACFT TO TAXI TO RWY 25L HOLDING POINT. RELIEF FO RELAYED TWR'S CALL TO THE FO AND CAPT AMIDST THE PROCESS OF HYD SYS CONFIGN. FO RESPONDED TO TWR '...TO TAXI TO RWY 25L HOLDING POINT.' CREW ASSUMED THAT SINCE WE WERE ALREADY HOLDING AT THE CAT II HOLDING POINT; AND HAD ALREADY CONTACTED TWR; THAT TWR INSTRUCTIONS WERE OBVIOUSLY MEANT AS INSTRUCTIONS TO TAXI FORWARD FROM OUR CAT II HOLDING POS TO THE CAT I HOLDING POS. CREW INITIATED TAXI AFTER WHICH TWR SHORTLY ADVISED CREW THAT TWR HAD WANTED US TO HOLD AT THE CAT II HOLDING POINT. CREW HALTED ACFT APPROX 1/2 WAY BTWN CAT II AND CAT I HOLDING POINT IN VFR CONDITIONS AND IN AN ENTIRELY SAFE POS IN REGARDS TO THE RWY AND ALL OTHER GND TFC.