2011 A Space Geodyssey

The final cache is at S41 DJMG C7T5 DJRA BEYL GLDB E173 A70X
A755 1210 B26B C7TP
You will need the Internet to solve this one.
Please put it back so it can NOT be seen and everything looks
nice and natural, including what you found near - yes, put that
back too please. Thank you.
The checksum of the missing S digits is 19 and the checksum of
the missing E digits is 23.