Well with a search on Google and a few torrent sites I couldn't find an .ISO for the Gamecube Service Disk 1.0/03, so I decided to dump mine:
Files can be merged with any program such as 7zip.
Part 1
http://www.mediafire.com/download.php?80nq5ha0d2fo6hm
Part 2
http://www.mediafire.com/download.php?1027adz3n98k4n4
Part 3
http://www.mediafire.com/download.php?mwz24q47hp836o6
Part 4
http://www.mediafire.com/download.php?06h2nqblmhn7qed
Part 5
http://www.mediafire.com/download.php?1y04mw0783tx1sm
Part 6
http://www.mediafire.com/download.php?mtn0zqscvmwfnh1
Part 7
http://www.mediafire.com/download.php?41r8fsr6088obao