NAGRA PL-L owner Question S

I recently purchased the Nagra PL-L after read the comment fr the member (Artg), get a good deal fr here and just send to Canada, it sounds really good as Artg discribed, since
I am a newbee, can someone suggest me some ideas how to improve the sound quality?? Good Powercord make any difference on this (it operate by DC..)

I also noticed that the DC supply ACPS run little warm when operate for few hrs, is that normal??

Also the DC meter sits on the lower end of the green area but not on the middle, is that normal too, what is other user's setting?? According to the manual, the green area is fr 11.6V to 13V....

I am confused by the page " ELECTRONIC SERVICES
BULLETIN", it said ....THE FUSE SITS ACTUALLY IN A
PLASTIC BAG INSIDE THE POWER SUPPLY SINCE JAN23/2002.

Does it mean there is a EXTRA fuse inside the power
supply and also inside the plastic bag??Do I need to
OPEN the power supply and take the EXTRA fuse out??if
there is a plastic bag inside the power supply, I am
afraid it will be melt because the power supply run a
little bit warm.

Thanks