Went thru all of the codes for this device on device code 17 IR codes 0-255 and alas, no discrete on and off codes seem to exist unless they are Sony System functions that this device would respond to (I've tried all of the other codes posted on RemoteCentral for Sony global On/Off too with no success).

The only item of note is that discrete 17 IR code 95 (and 223 see below) is Fade in / fade out which does not appear on the original remote. The pronto code is:

0000 0068 0000 000D 0060 0018 0030 0018 0030 0018 0030 0018 0030 0018 0030 0018 0018 0018 0030 0018 0030 0018 0018 0018 0018 0018 0018 0018 0030 03A5

by the way, there only appear to be 127 IR codes for this device - codes 128-255 are repeats of 0-127.