Code lists and manuals for GE remotes are available from http://www.jascoproducts.com/support/universal-remote-codes.asp
. The 3-digit code list is here: http://www.jascoproducts.com/support/download-files/RemoteCode-3-Digit.pdf
. The Sony DVD player codes to try are 166, 320, 321, 322, 361, 389, 399, 909 . (Sony DVD recorders may use 302, 321, 322.)
However, the codes programmed into a universal remote are limited to those for devices released 6 months or more before the remote was programmed. If your DVD player is newer than your remote, you may need a newer universal remote.
I hope this helps.