To go down in the Service Center on the 747,  a person has to lift up the 
carpet in the aisle next to the second row of seats fwd of the left fwd 
entrance door.  Now this ladder that goes down in this area is just fwd of 
the center fuel tank (as I recall).  I'll get the manual out and take a look. 
 If I waste to much time on line here I'll loose it all and get cut off.  I 
may have to  answer this at another time.  I'll research it a little more 
before I say for sure.
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