I tried the Nevo Database and learnt some codes to a Pronto remote and their codes are different.

Protocol= Sony20
Device= 26.19

This is the same Device Number as XM Radio.
[Link: hifi-remote.com]


Here is learnt Power Toggle for you to try. It is at 40.244 KHz.
Function 21
0000 0067 0000 0015 0060 0018 0030 0018 0018 0018 0030 0018 0018 0018 0030 0018 0018 0018 0018 0018 0018 0018 0030 0018 0018 0018 0030 0018 0030 0018 0030 0018 0030 0018 0018 0018 0018 0018 0030 0018 0018 0018 0018 0018 0018 021C

Generally  + or - 1KHz does not effect the Device responding to an IR Signal.

MakeHex at 40KHz (39.857 KHz)
Device Code: 26.19 Function: 21
0000 0068 0000 0015 0060 0018 0030 0018 0018 0018 0030 0018 0018 0018 0030 0018 0018 0018 0018 0018 0018 0018 0030 0018 0018 0018 0030 0018 0030 0018 0030 0018 0030 0018 0018 0018 0018 0018 0030 0018 0018 0018 0018 0018 0018 020E

If you have no luck with them, you may need to get hold of Pronto Remote and learn the codes to it.

Cheers
Jason